请教 prep 破解第150题

150. (32705-!-item-!-188;#058&007266)
Hydrocarbons, with which fruit flies perfume themselves in species-specific blends, are known to be
important in courtship, and apparently this assists flies that taste the hydrocarbons on prospective
mates to distinguish their own species from that of others.
(A) and apparently this assists flies that taste the hydrocarbons on prospective mates to distinguish
their own species from that of
(B) and apparently this assists flies when they taste the hydrocarbons on prospective mates in
distinguishing their own species from those of
(C) which apparently assists flies that taste the hydrocarbons on prospective mates in being able to
distinguish their own species from
(D) apparently assisting flies to taste the hydrocarbons on prospective mates to distinguish their
own species from those of
(E) apparently assisting flies that taste the hydrocarbons on prospective mates in distinguishing
their own species from

答案说this和which不能指代整个前句，this可以理解，但which在非限定定语从句里明确是可以的，这里C就是这样，望指教！！！

BTW，这个prep破解和prep的题号是怎么对应的？老是在CD上找不到同号题

不记得答案了，是选E吧？

GMAT有一套自己的语法。 Which不可以指代一个句子。

好像是E，GMAT有自己的一套语法？晕死，随手在google上就可以找出一堆whcih指代整句子的例子，

1）The weather turned out to be very good, which was more than we could expect

2）It rained hard yesterday, which prevented me from going to the park

确定一定以及肯定，GMAT的语法本着的原则就是逻辑清楚，没有歧义，简洁。所以以前学的语法不一定能够用的。