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for what which refer to?


maverick312

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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

 

here which referes to effects or alcohol abuse? can any one provide me the underlying explanation ?

 

there is quite good link on pronoun reference, but it didn't cover my question

 

http://www.www.urch.com/forums/gmat-sentence-correction/37280-antecedents.html

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