老prep 1-Q35

snail007

In laboratory rats, a low dose of aspirin usually suffices to block production of thromboxane,
which is a substance that promotes blood clotting, but not seriously interfering with the
production of prostacyclin, which prevents clotting.
(A) which is a substance that promotes blood clotting, but not seriously interfering
(B) a substance that promotes blood clotting, but not seriously interfering
(C) a substance that promotes blood clotting, but does not seriously interfere
(D) which is a substance to promote blood clotting, but does not seriously interfere
(E) which is a substance that promotes blood clotting, but not a serious interference  

C is the answer

Why D is not correct?
语法笔记上面说but does…更像是跟is a substance…并列,从而作为了thromboxane的谓语动词,改变了原句的意思

我觉得很牵强，C中，that promotes blood clotting, but does not seriously interfere 也可以看作并列导致歧义不是么？
为什么这里的which从句不对呢？

deeanabj

D中的 which指代是的前面的 production of thromboxane，也就是说， production of thromboxane to promote bolld clotting意思是不通的。production of thromboxane指的是a substance ，that 所指代的就是 a substance， 因此，由 a substance promotes blood clotting的意思就是通顺的。

snail007

D中的 which指代是的前面的 production of thromboxane，也就是说， production of thromboxane to promote bolld clotting意思是不通的。production of thromboxane指的是a substance ，that 所指代的就是 a substance， 因此，由 a substance promotes blood clotting的意思就是通顺的。

-- by 会员 deeanabj (2009/12/27 13:52:59)

谢谢！
可记得which 修饰非限制定语从句的时候，指代的是最靠近的名词，
比如， He is one of  the students which +V.
这里的动词V都应该用复数而不是单数，所以which 并不指代前面的整体，而是最近的那个单词，对么

deeanabj

在“one of+复数名词+定语从句”中，定语从句一般被看成修饰复数名词，因此该从句的谓语用复数形式；在“the only one of+复数名词+定语从句”中，定语从句常看成修饰单数名词，从句谓语用单数形式。但是，你说的这个例子中，不应该用which,而应该用who,因为one of the students是指人，不是物。