—Why does the lake smell terrible?
—Because large quantities of water           .
A．have pollutedB．is being pollutedC．has been pollutedD．have been polluted
D
考查主謂一致及時(shí)態(tài)。large quantities of +不可數(shù)名詞，謂語動(dòng)詞用單數(shù)，根據(jù)句意用現(xiàn)在完成時(shí)。句意：——為什么這湖這么難聞？——因?yàn)榇罅康乃呀?jīng)被污染了。
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