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.
问题： in B and D (perhaps violent) is awkward and less clear than the more developed clause which may be violent.
如何判断哪种修饰更好的？属于分词短语和定语从句的区别吗？这种区别总是成立吗？还是要看具体表达的效果？
请指点 谢谢！
modifier of mood swings in B and D: perhaps violent without being grounded in mental disease --- adj. + without 短语 , 不知道是什么结构, 且 without 应跟名词, 这里中心词是being grounded, 所以是 is awkward.
--- Open to discuss.
need explanation
up
A去掉their正确吗？
虽然有distinguish between但也有distinguish。。。from啊
我感觉修饰成分里，越简洁越好，分词优于从句的，但是有个前提，除非有主谓或逻辑或者时态上的关联，否则分词不能有跨越修饰。当分词修饰显的难以表达，或者有多个修饰成分的时候，从句的表达较为清晰，选择从句。
perhaps violent without being
grounded in mental disease
adv+adj+介词+ing，不知道算什么结构
不是分词结构啊，所以还是倾向于定语从句
对C没有意见。只是觉的A要是去掉their，是不是也正确呢？
I agree that if "their" is removed in A, A is correct.
Now back to "perhaps violent without being..." question:
This phrase, a parathetic expression, is separated from the sentence by two commas ",". What's the grammar rules of parathetic expressions?
Can we treat "perhaps violent without being..." as "which is" being omitted? That is, "which is perhaps violent without being ..."?
Thanks.
A去掉their正确吗？
虽然有distinguish between但也有distinguish。。。from啊
我感觉修饰成分里，越简洁越好，分词优于从句的，但是有个前提，除非有主谓或逻辑或者时态上的关联，否则分词不能有跨越修饰。当分词修饰显的难以表达，或者有多个修饰成分的时候，从句的表达较为清晰，选择从句。
perhaps violent without being
grounded in mental disease
adv+adj+介词+ing，不知道算什么结构
不是分词结构啊，所以还是倾向于定语从句
对C没有意见。只是觉的A要是去掉their，是不是也正确呢？
distinguish between right and wrong.
辨别是非
（常与from连用）使别于；有…特点
Speeches distinguishes man from the animals.
言语使人区别于动物。
(用from的时候要小心，分辨两个的话优先用distinguish between and)
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