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Executives and federal officials says 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 $100 billion a year.
(B) significantly compounding the effects of drug and alcohol abuse, which already cost business
(E) significantly compounding the effects of drug and alcohol abuse, and already costs business
为何选B, 而不是选E呢? "already cost business" 的主语是什么呢?
[此贴子已经被作者于2004-4-29 9:38:05编辑过] | 
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发表于 2004-4-29 09:37:00
