一个小问题：关于which的跳跃指代

在GMAT中，which 就必须修饰紧跟在它前面的那个词吗？有没有“跳跃指代”这么一说？ 比如......N1 of N2, which......,这样对吗？

显然句意上理解N1是中心词。那这种情况到底能否“跳跃指代”？

which 原则上是就近修饰，但是这不是绝对的。

你说的这个结构 A OF B, WHICH  一般可能会出现跳跃修饰情况，是否跳跃可以从逻辑意思和谓语动词来判断

OG10-119. Executives and federal officials say that the use of crack and cocaine is growing rapidly among workers, significantly compounding the effects of drug and alcohol abuse, which already are a cost to business of more than $100 billion a year.

(A) significantly compounding the effects of drug and alcohol abuse, which already are a cost to business of
(B) significantly compounding the effects of drug and alcohol abuse, which already cost business
(C) significantly compounding the effects of drug and alcohol abuse, already with business costs of
(D) significant in compounding the effects of drug and alcohol abuse, and already costing business
(E) significant in compounding the effects of drug and alcohol abuse, and already costs business

这个就是which跳跃修饰的例子

多谢指教！不过我没有OG10，这题选B是吗？