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标题: 新PREP1-256，求助 [打印本页]
作者: ghgriffin 时间: 2009-5-27 16:01
标题: 新PREP1-256，求助
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A. when it is known that humans made
B. at whichit is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make
作者: wzsgdtc 时间: 2009-5-27 17:20
这是一道gwd争议题呀~不过我忘了是哪一套上的题。。。
作者: gmatgong 时间: 2009-5-27 21:42
其实，由于修饰的是date，所以很容易排除A、D、E项，剩下B和C，排除B，罗嗦！“被知道人们已经开始使用stone tools的最早的日期”！用完成式完全解释的清啊！
作者: vivian_dong 时间: 2009-7-15 03:36
菜鸟问为什么修饰date就把when排除呢？我记得白勇语法里数date就是与when搭配用的呀？我记错了吗？谢谢。
作者: 松鼠gg 时间: 2009-7-15 08:28
1.这道题需要一个定语从句修饰date，
一般情况下我们用，the date (when/at which/that)+什么事情发生/什么人做了什么
这里中间加上"it is known that"意思上就不通顺了,因为"it is known that"这种句型本身不是一个用来改定语从句的好材料。
A和B就排除了。
至于是when/at which/that，我拿不准是不是gmat有特别的要求，感觉一般都可以用的。
D的话，这里没有正在进行的意思，所以making是不对的。
E扭曲了意思，这里想说的是人类制造石器这件事情的时间，所以date的定语应该是一件事情，而不是humans。
用完成时"to have made"表示一种动作发生在过去的意思。比如：
A number of hurricanes are known to have impacted on Tuvalu during the nineteenth and twentieth centuries.
Mongoloid descent and are known to have created an advanced civilization in the highlands of the Altai Mountains between 600 and 300 BC.
作者: vivian_dong 时间: 2009-7-15 22:54
谢谢松鼠GG啦
作者: Liu_leaf 时间: 2009-7-15 23:25
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A. when it is known that humans made
B. at whichit is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make 原句的earliest最高级修饰date强调时间点，所以使用at which由于when；A，B选项逻辑意思严重违背原句意思，A，B选项的意思是humans made stone tools被it is known的时间被push back...；原句是想说human are known to have made stone tools的时间被pushing back；
过去已经发生的事情，现在被发现也是现在完成时使用的情况之一。
原句的earliest最高级修饰date强调时间点，所以使用at which由于when；A，B选项逻辑意思严重违背原句意思，A，B选项的意思是humans made stone tools被it is known的时间被push back...；原句是想说human are known to have made stone tools的时间被pushing back；
过去已经发生的事情，现在被发现也是现在完成时使用的情况之一。
作者: poirotsky 时间: 2009-9-7 00:34
从逻辑的角度考虑：发现sediments把人类制造石器的历史往前推了more than 150,000 years,那时人类已经制造了石器了。
作者: piggyuu 时间: 2009-10-7 07:24
虽然知道别的选选项有更错的地方
但C的时态真是让我纠结半天，总感觉要么用过去时，要么用过去完成时。
干嘛要用现在完成呢？希望NN解答下！！
作者: FFcapm 时间: 2009-11-16 05:59
1.这道题需要一个定语从句修饰date，
一般情况下我们用，the date (when/at which/that)+什么事情发生/什么人做了什么
这里中间加上"it is known that"意思上就不通顺了,因为"it is known that"这种句型本身不是一个用来改定语从句的好材料。
A和B就排除了。
至于是when/at which/that，我拿不准是不是gmat有特别的要求，感觉一般都可以用的。
D的话，这里没有正在进行的意思，所以making是不对的。
E扭曲了意思，这里想说的是人类制造石器这件事情的时间，所以date的定语应该是一件事情，而不是humans。
用完成时"to have made"表示一种动作发生在过去的意思。比如：
A number of hurricanes
are known to have impacted on Tuvalu during the nineteenth and twentieth centuries.
Mongoloid descent and
are known to have created an advanced civilization in the highlands of the Altai Mountains between 600 and 300 BC.
-- by 会员 松鼠gg (2009/7/15 8:28:00)
support...
作者: jackcxp 时间: 2009-12-12 21:57
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date
when it is known that humans made stone tools.
A. when it is known that humans made
B. at which
it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make 原句的earliest最高级修饰date强调时间点，所以使用at which由于when；A，B选项逻辑意思严重违背原句意思，A，B选项的意思是humans made stone tools被it is known的时间被push back...；原句是想说human are known to have made stone tools的时间被pushing back；过去已经发生的事情，现在被发现也是现在完成时使用的情况之一。
原句的earliest最高级修饰date强调时间点，所以使用at which由于when；A，B选项逻辑意思严重违背原句意思，A，B选项的意思是humans made stone tools被it is known的时间被push back...；原句是想说human are known to have made stone tools的时间被pushing back；
过去已经发生的事情，现在被发现也是现在完成时使用的情况之一。
-- by 会员 Liu_leaf (2009/7/15 23:25:00)
严重同意，when和at which并不是最大的问题，A最大的错是错在扭曲本来想表达的句意。
作者: subaru6385 时间: 2010-3-29 14:18
嗯 明白了 感谢！
作者: sheilaring 时间: 2010-7-3 14:24
主要的问题 是在于从句后的主语 按照逻辑 前面讲的 是指人类 所以后面从句的主语应该是humans
when ,at which are all okay here.
作者: rebekah705 时间: 2010-7-17 10:22
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
我觉得A主要问题在 定语从句引导词用了When而没用which, 这里要修饰的先行词是date, 而若用when 引导，前面不能是date。 还原来开，it is known that humans made stone tools when, 后面这句可以看成it 是形式主语，再把date 带入从句， 则句子成为that humans made stone tools is known date 这里缺少一个介词。
B 虽然解决了when的问题，可是语义不对。同理调换顺序后等于 that humans had made stone tools is known at date. 这样来看，date指的是人类最早开始做石器这件事 被知道 的时间， 而非指所知道的 人类最早开始做石器的 时间。 体会。
C 人类被知道开始做石器的时间。 date 指 have made stone tools. 这里的 不定时用to have done, 表示动作的已经完成，完全可以。
作者: vampireking 时间: 2010-8-1 16:59
可以看一下国外论坛上的解释
Hi, all
Please can anybody help me with this sentence correction question:
Scientistshave dated sharp-edged flakes of stone found in the fine-grainedsediments of a dry riverbed in the Afar region of Ethiopia to between2.52 and 2.60 million years ago, pushing back by more than 150,000years the earliest date when it is known that humans made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make
Theans is c but I chose a. Why a is incorrect？Shouldn't "date" be followedwith "when"? And is it necessary to use past perfect tense as in choicec? I would like to choose the simple past tense.
Thank you in advance for your kind help~
babayu
thisis one of those problems from which you can learn about the ways inwhich these sorts of constructions are used. indeed, it is preciselyfrom these sorts of problems that you must learn about the niceties of these constructions, as the gmat's usage can, and does, sometimes vary from that of other sources.
inthis sort of construction, i'm pretty sure that either "when" or "atwhich" would be acceptable. (clearly, the latter is acceptable -- itappears in the correct answer, after all -- but i wouldn't object tothe former.)
if you want to get really subtle, i think (not 100%sure) that "the date when" is used for actual, precise calendar dates,whereas "the date at which" is used for the usually more vague dates ofhistorical events, such as the one in this problem. but i'm sure thetest is not going to depend on this sort of nuanced difference.
ithink the real problem with the construction in choice (a) is that theclause following "when" is "it is known". in other words, that choicesuggests that the fact is (was?) known at that date, an interpretation that clearly doesn't make sense in context.
inthe correct answer, the "at which" is followed by a clause whosesubject is "humans", and which describes the actual action that tookplace at that date. therefore, i think the idea is that this clausemore accurately describes the chronology of the events: i.e., thetoolmaking happened at that date, and the fact is known now.
as for your other question, this isn't really a perfect tense, because it's actually not a tense at all -- it's an infinitive.
probablythe easiest way to go here is to remember this as an idiomatic usage ofthe construction "known to". if the action is in the present, then youuse "known to VERB"; if the action is in the past, then you use "knownto have VERBed". as far as i know, these are the only two possibleforms.
作者: dumengxuan 时间: 2011-6-4 11:40
12套 挨千刀的居然对错一套题答案当时就想死了
作者: AnnieFFish 时间: 2016-9-11 12:01
醍醐灌顶！
确实AB这个意思被扭曲
看来还是要好好理解句意
作者: 考拉飞起 时间: 2017-11-5 09:52
this is one of those problems from which you can learn about the ways in which these sorts of constructions are used. indeed, it is precisely from these sorts of problems that you must learn about the niceties of these constructions, as the gmat's usage can, and does, sometimes vary from that of other sources.
in this sort of construction, i'm pretty sure that either "when" or "at which" would be acceptable. (clearly, the latter is acceptable -- it appears in the correct answer, after all -- but i wouldn't object to the former.)
if you want to get really subtle, i think (not 100% sure) that "the date when" is used for actual, precise calendar dates, whereas "the date at which" is used for the usually more vague dates of historical events, such as the one in this problem. but i'm sure the test is not going to depend on this sort of nuanced difference.
i think the real problem with the construction in choice (a) is that the clause following "when" is "it is known". in other words, that choice suggests that the fact is (was?) known at that date, an interpretation that clearly doesn't make sense in context.
in the correct answer, the "at which" is followed by a clause whose subject is "humans", and which describes the actual action that took place at that date. therefore, i think the idea is that this clause more accurately describes the chronology of the events: i.e., the toolmaking happened at that date, and the fact is known now.
as for your other question, this isn't really a perfect tense, because it's actually not a tense at all -- it's an infinitive.
probably the easiest way to go here is to remember this as an idiomatic usage of the construction "known to". if the action is in the present, then you use "known to VERB"; if the action is in the past, then you use "known to have VERBed". as far as i know, these are the only two possible forms.
作者: daisylol 时间: 2018-5-6 18:36
同意！
作者: idsamsang 时间: 2018-7-25 09:03
个人觉得这道题目的关键在于 知道动作和时间之间的逻辑。 A 和 B 都是说人类制作工具这件事在150000年就被知道，显示不符合逻辑。作者要表达的是在150000年人类就已经制作工具了。那么只有 C 可以准确的说明 人类150000年也就是最早的这个时间知道去制作工具。
作者: maggie790 时间: 2018-8-13 03:54
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