题目内容

------ Why does the lake smell terrible?
------ Because large quantities of water _________.
A．have been pollutedB．has polluted
C．have pollutedD．has been polluted
A
考查主谓一致与语态。large quantities of +名词作主语，位于动词用复数；water与pollute构成被动的关系。所以选择A。
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