大全section 9-26

大全section 9-26

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（B）

(E) significant in compounding the effects of drug and alcohol abuse, and already costs business

答案是B，OG里的解释说

Choices D and E produce faulty constructions with the phrase significant in compounding, which cannot grammatically modify the verb form is growing.

 可是significantly前面不是有逗号吗？这样它还是修饰is growing的么？不是说逗号后面的成分应该就近修饰逗号前面的那个词语的吗?

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