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一道语法题求指教

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发表于 2012-5-22 22:33:29 | 只看该作者 回帖奖励 |正序浏览 |阅读模式
题目:
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.]
画线部分为[]中的部分,

A. mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis (即原句)
C. between mood swings, which may be violent without being grounded in mental disease, and genuine manic-depressive psychosis.

答案:C

请问A选项中without their being 是错的吗?我记得动名词有个复合结构,介词+物主代词+动名词,这里为什么错呢?
C选项中将distinguish...from...换成了distinguish between...and... 这两个短语可以互相替代吗?我觉得distinguish from好像更侧重前者,而distinguish between就两者侧重程度相同了。

谢谢!
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沙发
发表于 2012-11-15 11:33:23 | 只看该作者
我看到有人对distinguish between...and ... 和distinguish ...from...的解释是:
从语法上讲distinguish A from B 和 distinguish between A and B 是都对的
但是一般distinguish A from B 这个A 和 B要是完全对立的两个东西;而这里mood swings和genuine manic-depressive psychosis都是两种情绪,并没有完全对立。
而且,一种说法就是ETS更加倾向于distinguish between A and B
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