2. Of ail the vast tides of migration that have swept through history, maybe none is more concentrated as the wave that brought 12 million immigrants onto American shores in little more than three decades.
(A) maybe none is more concentrated as
(B) it may be that none is more concentrated as
(C) perhaps it is none that is more concentrated than
(D) maybe it is none that was more concentrated than
(E) perhaps none was more concentrated than
选E？
2. Of all the vast tides of migration that have swept through history, maybe none is more concentrated as the wave that brought 12 million immigrants onto American shores in little more than three decades.
(A) maybe none is more concentrated as
(B) it may be that none is more concentrated as
(C) perhaps it is none that is more concentrated than
(D) maybe it is none that was more concentrated than
(E) perhaps none was more concentrated than
This sentence depends on the comparative structure x is more than y. Here, an idiomatically incorrect construction x (none) is more as y (the wave) is used. In addition, the second part of the sentence uses the past tense verb brought, indication that the event is over. The verb used in the comparative construction must also be past tense, x (none) was more concentrated than y (the wave). Maybe and perhaps are interchangeable; perhaps is slightly more formal.
A In correct idiom is used for comparison; is concentrated is the wrong tense
B In correct idiom is used for comparison; it may be that is wordy
C It is none that is more… is a wordy and ungrammatical construction
D It is none that is more… is a wordy and ungrammatical construction
E Correct. The correct comparative construction is used in this sentence; the verb is past tense.
The correct answer is E.
Thank you, Corolhide, again
perhaps > maybe, 在正式的书面语中只能用perhaps
C it is none that was 的形式不简洁，原文可以直接用none was
有一个问题，问一下大牛们，那个of all the vast tides of migration 放在句首是其什么作用呢？？？
是不是介词修饰提前呢？？？？
2. Of all the vast tides of migration that have swept through history, maybe none is more concentrated as the wave that brought 12 million immigrants onto American shores in little more than three decades.
(E)
perhaps none was more concentrated than --> perhaps none is more concentrated than
前边用的是现在完成，“have swept through history", 为什么E不能用 "is" ？“没有比。。。更集中的了”这可是历史事实呀。
还是没有搞清楚这里的时态为什么是一般过去时。
这个好像不可以作为理由吧？我编个例子虽然有些别扭
Among the current NBA players, none is greater than Jordan who won 5 NBA champions.
忽然觉得之所以用过去时态，是因为前面用了完成时have swept，表示这些Tide都在过去.
是过去的事件群(all the vast tides)中的其他事件(none)与其中某一事件(the wave that brought...)的比较。
没人回？
如果说"毛泽东对中国的贡献比邓小平对中国的贡献大"，用is or was?
如果说"邓小平对当代人的影响比毛泽东对当代人的影响大"，用is or was?
有人吗？都看世界杯去了...
东方老师是这么讲的：
"of all the vast tides of migration..."中"of all the..."意思是曾经发生的／所有的...，那么提出全是曾经发生过的进行比较时就自然要用过去式了．
东方老师是这么讲的：
"of all the vast tides of migration..."中"of all the..."意思是曾经发生的／所有的...，那么提出全是曾经发生过的进行比较时就自然要用过去式了．
C. D. it is none that is/was… 多余，it 做先行词引导一个强调句结构，但谓语动词为be动词的结构不适用强调结构，个人意见仅供参考，请各位指正
首先觉得有个perhaps就表明其后面的并非历史事实，而是一个推断或者猜测，应该不能随便用is；另外该句说在已经完成的一堆事件中，没有一个比另外一个事件更XX，强调过去的情况是“没有一个比另外一个事件更XX”，也并不表明现在的情况和过去的相反。 ----个人意见
有一疑问请教大牛，
OG解释说maybe和perhaps可互换，只是perhaps 稍微正式一点，并且在分选项解释时也没有突出强调两者的区别。
所以想请教的是，这两者的区别是不是只是effectiveness ,而不是correctiveness？
请各位指教
有一疑问请教大牛，
OG解释说maybe和perhaps可互换，只是perhaps 稍微正式一点，并且在分选项解释时也没有突出强调两者的区别。
所以想请教的是，这两者的区别是不是只是effectiveness ,而不是correctiveness？
请各位指教
我不知道是不是你说的那个问题，但我知道，probably,perhaps,maybe中，优先使用probably,其次perhaps,最后才是maybe
谢谢yichousun
(C) perhaps it is none that is more concentrated than
这里的介词perhaps在比较意义上比maybe强,该选项的不足之处在于用it is句式加none引导的定语从句的复杂形式来表达一个简单句的意思.
从而使句子语法结构复杂而且意思不十分明确.
(D) maybe it is none that was more concentrated than
此选项的介词maybe选用不恰当,语意太弱.整句表达的意思不明晰.另外后面接的it is 句式错误明显.
(E) perhaps none was more concentrated than
最佳选项. 这里的was使用最恰当,因为这里的比较都是在过去时间发生的migration事件中进行比较,时态只能用一般过去时.不能理解为一般
真理性事实而用现在时.这里强调的是过去所有发生的事件的比较.没有总结世界的一般性规律.
1. 要特别注意主谓一致问题。例如，
It is I that am totally responsible for the failure to carry out the task in time. (I am…)
这项任务没有按时完成是我负全责。
It is his noble deeds that have drawn the public’s attention. (deeds have…)
是他高尚的行为引起了公众的注意。
2. 如果原句中含有not…until, 转变成强调句时，其结构为：It is (was) not until…that…。例如,
I didn't recognize her until she took off her dark glasses.
It was not until she took off her dark glasses that I recognized her.
直到她摘下墨镜我才认出她来。
3. 要特别注意it强调句结构的疑问句形式。如果原句是一般疑问句，其强调结构为：Is (Was) it…that…？；如果原句是特殊疑问句，其强调结构为：特殊疑问词＋is (was)it that…？。例如，
Was it at this theatre that he was murdered ?
他是在这个剧院里被暗杀的吗？
How was it that he became a famous singer ?
他究竟是怎样成为一名著名歌手的？
What is it that has made you so angry?
究竟是什么使你这么生气？
4. 要特别注意在宾语从句中的it强调句结构的陈述句语序。例如，
Tell me what it is that has made you change your mind.
告诉我究竟是什么使你改变了主意。
Do you know why it is that he has done away with his family and run away?
你知道他究竟是为什么离家出走？
5. 除了强调指人的主语或宾语可以分别用who 或whom 来替代that 外，强调其他成分一律用that。例如，
It was at that very moment that I began to realize that I had met him somewhere before.
就在那个时候我开始意识到我以前曾在什么地方见过他。
It was in the park where they first met that they said goodbye.
他们就是在第一次见面的公园里分别的。
maybe it is none that was more concentrated than
两个时态不一致
收回上面的言论。我错了。
2） It is + 名词（代词、形容词） + that (who, whom, which, whose) + 句子
这种结构强调名词或代词。
我到觉得这里是wordy的问题，而不是ungrammatical的问题。
理论是讲得通，问题是没有其他的例句佐证。我在找找
不好意思，前面思考的方向出现偏差。现在重新讨论。
1 wordy的问题是和其他选项比较出来的。it is none that...和none is...比较起来，确实是wordy。不多谈。
2it is none that的ungrammatical问题。这涉及到比较结构。比较结构的比较对象要求在语法和逻辑上都能比较。逻辑比较只可意会，不可言传，不好多说。但语法比较是要求主语和主语比，谓语和谓语比，等等之类。本题是很明显的主语和主语之间的比较，也就是none和the wave比，如果用it is none和the wave比，就是不和语法结构。这一点还请xdjm们在总结比较结构时多加体会。
在有，it is none that本身是不存在语法问题的，也不是说none不能用与强调结构（前面看有牛人说是强调结构的问题，因此走进了这个死胡同，最近在总结比较结构的时候发现了这的问题），大家可以google一下none在强调句的例子，有很多。欢迎大家拍砖。
东方老师是这么讲的：
"of all the vast tides of migration..."中"of all the..."意思是曾经发生的／所有的...，那么提出全是曾经发生过的进行比较时就自然要用过去式了．
og11-23中有这个of all the的例子，是“所有的...”意思。
og23 Of all the possible disasters that threaten American agriculture, the possibility of an adverse change in climate is maybe the more difficult for analysis.
(A) is maybe the more difficult for analysis
(B) is probably the most difficult to analyze
(C) is maybe the most difficult for analysis
(D) is probably the more difficult to analyze
(E) is, it may be, the analysis that is most difficult
This sentence compares an adverse change in climate to all possible disasters, so the superlative form most difficult must be used in place of the comparative form more difficult. The sentence also uses two incorrect idioms: maybe should be replaced by probably, and the adjective difficult should be followed by the infinitive to analyze rather than the phrase for analysis.
比较的前后时态一致
对于为什么用was而非is，我个人的浅见是
is所处的地方，跟brought更接近，同属一个句子里面，没有特别的原因，不要用两种时态。
而of开头的介词短语，是状语成分，而且用comma跟主句隔开了，用不同的时态，没有任何问题。
it is none that....做强调句没错。个人理解之所以说是ungrammatical是因为前面‘of all the vast tides of migration that...,’是作修饰语的成分修饰none。换句话说，如果换作强调句的结构，则‘of....’这部分修饰的成分就修饰it了。
我们有听说some of , all of ,none of ,但没听过it of。以上是个人的理解。
此外对于时态我还是想不通。还有，none后如果跟复数名词，动词不是应该复数吗？此题中为什么是is而不是are？请教！
刚查了朗文，对于none后接动词的问题已解决。
After the plural noun, you can use a plural or singular verb. You should use a singular verb in formal writing
• None of us care OR cares what happens to him.
• None of us is able to escape the consequences of our actions.
it is none that....做强调句没错。个人理解之所以说是ungrammatical是因为前面‘of all the vast tides of migration that...,’是作修饰语的成分修饰none。换句话说，如果换作强调句的结构，则‘of....’这部分修饰的成分就修饰it了。
我们有听说some of , all of ,none of ,但没听过it of。以上是个人的理解。
此外对于时态我还是想不通。还有，none后如果跟复数名词，动词不是应该复数吗？此题中为什么是is而不是are？请教！
强调句里 it is 是不做成分的,所以不是修饰it 的.
我认为，CD选项中的强调语法结构是没有问题的，只是原文没有表达强调之意，选项中也不可以随便改变句意。
我认为最关键还是比较结构more than，比较的是主语，但是如果加上强调结构，more前面跟的就是一个句子结构，than后面跟the wave是一个名词，这样比较结构就说不通了。
欢迎拍砖
这道题我的做题思路是：
1. more than 结构，这是一个correctiveness问题，排除了AB
2. 一般来讲
probably>perhaps>maybe, so排除D
3. it is none that is 和none was 是根据 more than的平行结果，none 和wave 平行；另外时态问题，我觉得用was/is均可。前面说migration 在历史上对现在的影响，而后面wave 用的brought，就说明是比wave （即前面的migration）的那个过去的时候更集中，这时none可以是现在的，也可以是过去的。
星耀苍穹 发表于 2006-8-23 14:59
以下是引用misia在2006-7-29 1:58:00的发言：各位大哥大姐, 小妹想請問: (C), (D)兩選項OG解釋提到的語法錯 ...
cdzymm 发表于 2007-8-28 01:08
(C) perhaps it is none that is more concentrated than这里的介词perhaps在比较意义上比maybe强,该选项的 ...
luoxiaoji 发表于 2009-10-17 21:08
这道题我的做题思路是： 1. more than 结构，这是一个correctiveness问题，排除了AB2. 一般来讲 ...
luoxiaoji 发表于 2009-10-17 21:08
这道题我的做题思路是： 1. more than 结构，这是一个correctiveness问题，排除了AB2. 一般来讲 ...
romeo12345 发表于 2011-12-20 23:34
忽然觉得之所以用过去时态，是因为前面用了完成时have swept，表示这些Tide都在过去.是过去的事件群(all ...
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