—Why does the lake smell terrible? —Beca...

—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】试题分析：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，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。考点：考察现在完成时以及主谓一致。

考点分析：

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