求NN回答关于ving的问题！

coconutmi

摇曳的叶子 发表于 2013-9-1 17:43
我认为是修饰从句
不过这可不是一个同位语。

又碰到你了~~~

请教下: Ving修饰的时候，对主句还是从句有定论吗?是不是需要自己判断句意来作决定呢？
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

coconutmi

摇曳的叶子 发表于 2013-9-17 09:24
，verbing的形式。
当且仅当前面有noun时，修饰noun。
其他情况修饰从句。

已经搞定G啦，赞~
加油！