OG11-75, why there is no verb of "as" clause

nancyhearste

如果把B选项改为：that had flourished at the same time as the civilizations had ,理解为过去一度flourished，改完的选项能选吗？

-- by 会员 leo9 (2009/5/11 11:00:00)

改完也还是错的，因为这里根本就不能用完成时，主句的谓语threaten为现在时，flourish相对threaten来说要用过去时flourished， 而两个相比较的an ancient civilization和the civilizations是同时florished， 他们之间没有动作和时间上的先后，就不能用过去完成时；而且，不能从现在时一下跳到过去完成时。

nancyhearste

这里不需要补足谓语动词，因为 an ancient civilization flourished 是主谓结构，没有宾语，不存在the civilizations会与宾语相比较的歧义，就不需要补足did,补足的话反而多余。

鸢儿gmat

我把楼上们的问题全部汇总回答一下：
1.为什么没有verb呢？
因为省略了。
if you have a parallel construction involving tensed verbs, and the tensed verb is EXACTLY THE SAME in both (or all, if there are more than 2) parts of the construction, then you may omit the verb in all but the first part.

for instance:
the rain was torrential and the wind fierce.
in this case, we're allowed to omit the second 'was', because it's identical to the 'was' in the first part.

same goes here: since the verb is exactly the same ("flourished") in both parts, you can omit it from the second part.

--

by the way, if you WERE going to include "did", preferred usage conventions actually place it BEFORE its subject: "...as did the civilizations in the nile delta..."
one would never speak this way, but it's the best way to write these sorts of constructions in formal usage.


2. 为什么不用those呢？
因为those没有指代的名词。

the antecedent of those       （those的先行词）  is the "ancient civilizations," but these only show up in other answer choices. This problem exposes a trick that is commonly played on the GMAT whereby a pronoun, such as those, is used in some answer choices when it's antecedent is in the other answer choices. If you read through the answer choices quickly without checking those you may not notice the error.

再补充一个Ron说的语法点：

if you're going to use a "relative pronoun + modifier" construction, then the modifier MUST be DIRECTLY attached to the pronoun.

e.g.
the population of argentina is more than ten times that of uruguay.
--> CORRECT
note that the modifier "of uruguay" is attached directly to "that" (a relative pronoun that stands for "population").


the number of people in argentina is more than ten times as large as that is in uruguay.
--> INCORRECT
you aren't allowed to split up "that of uruguay".

note that this single consideration will actually eliminate all of (c), (d), (e).


3.并且 BC选项时态错了！未划线部分的时态是一般过去，因此从句用过去完成时错了。


以上分析源自manhattan论坛。受益匪浅 and hope those help.

Alpha4Dream

那可不可以改成 “that flourished at the same time as those”呢？

linhunyiou

nancyhearste 发表于 2010-7-30 07:22
这里不需要补足谓语动词，因为 an ancient civilization flourished 是主谓结构，没有宾语，不存在the civi ...

同意！