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---Why does the lake smell terrible? ---...

---Why does the lake smell terrible?

---Because large quantities of water ________.

A.have polluted B.is being polluted

C.has been polluted D.have been polluted

 

D 【解析】 考查时态。句意:---为什么这湖闻起来那么难闻?---因为大量的水被污染了。从问句和答语可知说的是湖的现在的情况,又因为强调污染对湖所产生了一定的结果和影响,所以用现在完成时,且表示被污染。故在C,D中选择正确答案。由于主语是quantities,谓语动词要用复数。故选D。  
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