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—Why does the river 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】

试题分析:考查时态。句意:——为什么这条河这么难闻?——因为大量的水已经被污染。根据语境可知,大量的水已经被污染,故用现在完成时态的被动语态,故选D。

考点:时态

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