15. In his research paper, Dr. Frosh, medical director of the Payne Whitney Clinic, distinguishes mood swings. which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis.
(A) mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis
(B) mood swings, perhaps violent without being grounded in mental disease, and genuine manic-depressive psychosis ,
(C)between mood swings, which may be violent without being grounded in mental disease, and genuine manic-depressive psychosis
(D) between mood swings, perhaps violent without being grounded in mental disease, from genuine manic-depressive psychosis
(E) genuine manic-depressive psychosis and mood swings, which may be violent without being grounded in mental disease
The best choice is C because it uses the idiomatically correct expression distinguishes between x and y and because it provides a structure in which the relative clause beginning which may be violent clearly modifies mood swings. The other choices use distinguishes in unidiomatic constructions. Additionally, their in A is intrusive and unnecessary, and the modifier of mood swings in B and D (perhaps violent) is awkward and less clear than the more developed clause which may be violent.
答案C没有问题。我的问题可能有些愚蠢。就是E为什么不可以，似乎改变结构以后，which修饰mood swings有歧义吗？ 活着说字少的要放在前面？谢谢！
distinguish between A and B，其中between不能少，E的致命错误；
which的指代不明，如你所言，另一个错误。
字多字少不是关键问题，关键在于结构是否合理，修饰是否明确。
which的指代还是明确的，a and b,which结构，which 修饰b
which的指代还是明确的，a and b,which结构，which 修饰b
一不留神已经有两位哥哥回答了。谢谢了。
stoneren gg 所指的“distinguish between A and B，其中between不能少，E的致命错误“的问题，我担心我考试时真会犯这样的错误。明明知道还当看不见，要命。
另外，有关which 的解释让我很明白了。将来看到这样的题目的时候可能不会在错了。但是自己写的时候就保不住了。记住了。
谢谢！
精辟!感谢诸位大人.
当然用这个时态了。without doing sth是固定用法，它的被动就是without being done。
这么说A去掉their也是正确的表达吧。
这么说A去掉their也是正确的表达吧。
A 是 distinguish mood swings from geniune ... 根据longman
1 [intransitive and transitive]
to recognize and understand the difference between two or more things or people
distinguish between
His attorney argued that Cope could not distinguish between right and wrong.
distinguish somebody/something from
a method of distinguishing cancer cells from normal tissue
2 [transitive not in progressive]
to be the thing that makes someone or something different or special
distinguish somebody/something from
The factor that distinguishes this company from the competition is customer
这里应该是1的解释，但是distinguish x from y 重要的一点是 x 应该属于 y
A 是 distinguish mood swings from geniune ... 根据longman
1 [intransitive and transitive]
to recognize and understand the difference between two or more things or people
distinguish between
His attorney argued that Cope could not distinguish between right and wrong.
distinguish somebody/something from
a method of distinguishing cancer cells from normal tissue
2 [transitive not in progressive]
to be the thing that makes someone or something different or special
distinguish somebody/something from
The factor that distinguishes this company from the competition is customer
这里应该是1的解释，但是distinguish x from y 重要的一点是 x 应该属于 y
不对吧，老兄，x应该不属于y的，我们平时说的distinguish good from evil/ distinguish right from wrong都是这样啊
不对吧，老兄，x应该不属于y的，我们平时说的distinguish good from evil/ distinguish right from wrong都是这样啊
x may or may not belongs to y.
1. Distinguish her from her classmates.
2. Disinguish the male birds from the femal ones
从longman字典的解释看不出distinguish btw 和distinguish ... from...的差别来，美国传统词典则只有distinguish ... from..地用法，看来distinguish between x and y有时一条gmat家规了。
顶一下,OG27题与此知识点类似. 选项B 有可能产生歧义,Who修饰Chandler Owen 还是A.Philip 呢!
without 的用法是without与后面的名词或是动名词中间不能有任何的插入词如their,any等等都是不可以的.
可是XDF老师的笔记里说有distinguish A from B啊
是他讲错了?/
without 的用法是without与后面的名词或是动名词中间不能有任何的插入词如their,any等等都是不可以的.
这是OG在解释57题的原话
In B, the active verb has shifted suggests that the light, not the motion, is the agency of action, but such a construction leaves the phrase by the rapid motion of the galaxy away from the Earth without any logical or grammatical function.
without 的用法是without与后面的名词或是动名词中间不能有任何的插入词如their,any等等都是不可以的.
应该是without+doing的用法更为准确些
which的指代还是明确的，a and b,which结构，which 修饰b
我觉得有疑义,在上XDF的时候老师说过,"n,which v"句型，which可以跳跃修饰，为什么此处which只修饰b呢？也可以修饰a吧？
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