prep1-50 (没办法一个人在北美学习，不懂只好求助各位了，拜托了）

33. Many teenagers undergo stress, but results of a recent study indicate that the patterns of stress that girls experience are more likely to result in depression than are those that boys experience.

A are those that boys experience

B what boys experience

C boys’ experience would

D boys’ stress patterns do

E stress patterns of boys

A: correct，than前面用名词，所以助动词补出；those指代patterns

B: 比较对象不对等

C: 同上

D: 句意改变，do应该为are

E: 不如原文表达的清晰，助动词应该补出

我一开始选A，后选了B，就错了。因为想起名词可以和名词性短语对称，并且感觉比A简洁，所有就错了，哪位大侠可以告诉我B为什么错吗？

我觉得比较对象应该是STRESS,that girls experience 是stress的定语呀，晕了。。。。。。

对不起对不起楼主，我误导了。

不过这句话的比较对象应该是patterns，不是stress，因为A of B的结构的中心词是A，不是B。

这句话的实际意思是不是应该是
Many teenagers undergo stress, but results of a recent study indicate that the patterns of stress that girls experience are more likely to result in depression than the patterns of stress that boys experience are.

比较前后的比较物形式要对称，对于前面曾出现过的不可数名词或单数名词要用that代替，可数名词的复数要用those代替，而what是连接代词，如果选B的话相当于一个名词和一个名词性从句比较了，比较形式错误（这点请牛人再确认一下）

如果选B的话，这句话是不是应该写成

Many teenagers undergo stress, but results of a recent study indicate that what girls experience is more likely to result in depression than what boys experience. （不知对不对）

另外用到了助动词尽量补出原则，即比较两个主语的时候，在than之后，要尽量补出谓语动词。

不知这次的解释楼主能否满意？还请牛人一起讨论。

我的理解：Many teenagers undergo stress, but results of a recent study indicate that the patterns of stress that girls experience are more likely to result in depression than boys experience to result in depression.

这个是不定式做宾语的主谓宾全的比较主语的结构：

选项A： the patterns of stress （that girls experience） are    more likely    to result in depression    than    are   those （that boys experience )

to result in depression 是不定式做宾语。

to result in depression 是不定式做宾语。

请看OG的例题：

主语比较_主谓宾_as+adj.+不定式宾语+as
156. Dirt roads may evoke the bucolic simplicity of another century, but financially strained townships point out that dirt roads cost twice as much as maintaining paved roads.
(A) dirt roads cost twice as much as maintaining paved roads
(B) dirt roads cost twice as much to maintain as paved roads do
(C) maintaining dirt roads costs twice as much as paved roads do
(D) maintaining dirt roads costs twice as much as it does for paved roads
(E) to maintain dirt roads costs twice as much as for paved roads
This sentence compares the costs required to maintain two kinds of roads. B, the best choice, is able to maintain parallelism in the comparison as well. Choice A incorrectly shifts the meaning by comparing the cost of dirt roads with the cost of maintaining paved roads. Choice C does the opposite: it compares the cost of maintaining dirt roads with the cost of paved roads themselves. Choice D further confuses the sentence by adding a nonparallel clause, it does for, in which it has no clear referent. Choice E introduces the infinitive phrase to maintain... and wrongly attempts to complete the comparison with the nonparallel prepositional phrase for....

B 选项中： what boys experience ：

   the patterns of stress （that girls experience） are    more likely   to result in depression    than      what boys experience

这里 what boys experience 存在两个问题：

1） what boys experience 和 the patterns of stress 不对等，不如用those 好。

2） 这里的谓语动词没有补出，容易造成宾语比较的混淆。

本来这题没有问题的，只是想看看有没有新思路（为了提高做题速度，每次遇到比较题都要象做数学题似的来回验证），，就发现killer又在，解释得详细明了，为什么不来做版主呢？不过没关系，你就当活雷锋吧

你真好，谢谢你！！

我要狂谢谢下killer

突然有个很弱的问题：

这道题目than 后 为何是：are   those （that boys experience ) ？而不是：those （that boys experience ) are ？

than those （that boys experience ) are  可以么？请NN指点。