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标题: 求问OG第17题，求大神指教having been done的用法。 [打印本页]

作者: Dreamout 时间: 2016-3-16 07:41
标题: 求问OG第17题，求大神指教having been done的用法。

17. Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun’s poles or equator.

　　(A) are visible as dark spots on the surface of the Sun but have never been sighted on

　　(B) are visible as dark spots that never have been sighted on the surface of the Sun

　　(D) appear as dark spots on the surface of the Sun, although never having been sighted at

　　(E) appear as dark spots on the Sun’s surface, which have never been sighted on

那个D选项老师说having been sighted时态有误。怎么有误了？能不能请大神说得详细点？

还有C选项省略也很合理啊。不就省了主句的主谓么？补上 Sunspots are就好啦。觉得这题根本问题是although 和but的逻辑关系体现，这里不是让步而是转折。

但是关于那个having been done还是希望大牛来解答一下!

作者: 医生吃鱼 时间: 2016-3-16 11:13
1、although和but从句意角度来说都可表示转折，目前没有看到GMAT以although和but的含义区别作为选项的错误。

2、although出现在句中，该although从句中不能省略主谓。OG答案解释是这么说的，另外OG中也找不出although从句省略主谓的正确例子。

3、having been done这个结构，只能做状语修饰主句。D选项中的although从句里应该有完整的主谓，having been done这个状语位置不明。

4、having been done结构中的动作时间，是早于主句动作的时间。但是该结构一般被认为wordy，因为它可以被done替换。
我在GMAT中只碰到过一个having been done算正确的句子：
Prep07-SC-154 ：Some patients who do not respond to therapies for depression may simply have received inadequate treatment, having, for example, been prescribed a drug at a dosage too low to be effective or having been taken off a drug too soon.

5、不要太纠结having been done这个结构，只要记住它就像with独立主格结构一样，不是必错的排除标志，但很少情况下是正确的。

作者: 415lethe 时间: 2016-3-18 00:09
having done可以做非限定性修饰，不能做限定性修饰。
夸克的语法大全里面明确写出having done做限定性修饰是错误的：
The perfective aspect cannot usually be expressed in the finite clause:
wrong: The man having won the race is my brother.
correct: The man who has won the race is my brother.

When having done 结构一定错，因为不应该有 when。单是 Having done 就够了。Have 有很多地方与正牌动词不同，When 后就不能用 having 了。原因是 having done 是过去，而 when 是当时，所以有冲突。
（同理的after/before A do sth. when B do sth.或者after/before when，这样的结构都是不好的。）

作者: elusive 时间: 2016-3-19 09:31
我的思路：
题目中有转折关系，所以正确选项里面也应该有转折关系。
E：which位置不好，可能说surface，此外删除which从句后发现句子无法表达原意，而且句子少转折词语。
D：这里having been done太复杂了，没有用having的需要。为什么？愿意说“从来没有被发现”而不是“从来没有直到现在一直正在被发现”。做题的结论告诉我们，having been done几乎没有在划线里面出现过。（注意，不要学习未划线部分的语法，很多都不能用在划线里面）
C although是连词，链接句子要加逗号。
B感觉怪怪的，怎么也不通顺。此外少了表示转折的词语.
A改正了所有错误。

很实用的一条结论：如果原味有表示因果和转折的词语，选项中没有这些词语的都是错的。错误的原因是改变句子意思。
此外用什么时态是有标志的。比如说出现了since，那么就是一般完成，出现比较过去两个动作先后关系，那就是had。

我做了GWD，3个prep，og，从没发现用having been done。（在划线中）

作者: elusive 时间: 2016-3-19 16:06
我找到了一个have been doing的题
Since February, the Federal Reserve has raised its short-term interest rate target five
times, and because of the economy ’ s continued strength, analysts have been
predicting for weeks that the target will be raised again in November.
A. because of the economy’ s continued strength, analysts have been predicting for
weeks that the target will
B. with the economy’s strength continuing, analysts predicted for weeks that the target
C. because the economy continues strong, analysts predicted for weeks that the target
would
D. due to the economy’s continued strength, analysts have been predicting for weeks
that the target
E. due to the fact of the economy’s continued strength, analysts predicted for weeks
that the target will.

predicted都错因为后面有一个for，要用完成时态，所以A和D对了。D里面due to不能放在开头，所以because of>due to.

作者: elusive 时间: 2016-3-20 09:18
又找到一道题：
Fossils of a whale that beached on an African shore more than a million years ago and was subsequently butchered by hominids have been recovered by paleontologists.
A. that beached on an African shore more than a million years ago and was subsequently butchered by hominids have
B. that beached on an African shore more than a million years ago and then was subsequently butchered by hominids has
C. that beached on an African shore more than a million years ago, which was subsequently butchered by hominids, has
D. having been beached on an African shore more than a million years ago and subsequently butchered by hominids, have
E. having beached on an African shore more than a million years ago and then subsequently were butchered by hominids have

答案A

作者: revebien 时间: 2019-8-10 20:38
新发现的having been done：

Rather than accept the conventional wisdom that the earth was flat, Christopher Columbus
was sent by the king and queen of Spain to see if he could reach India by traveling west.
• Rather than accept the conventional wisdom that the earth was flat, Christopher Columbus
was sent by the king and queen of Spain to see if he could reach India by traveling west.
• Rather than accepting the conventional wisdom that the earth was flat, Christopher Columbus
was sent by the king and queen of Spain to see if he could reach India by sailing west.
• Instead of accepting the conventional wisdom that the earth was flat, Christopher Columbus
sailed west to see whether he could reach India, having been sent by the king and queen of
Spain.
• Rather than accept the conventional wisdom that the earth was flat, Christopher Columbus
sailed west to see whether he could reach India, having been sent by the king and queen of
Spain.
• Instead of accepting the conventional wisdom that the earth was flat, Christopher Columbus
was sent by the king and queen of Spain to sail west to see if he could reach India.

正确选项D

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