------ Why does the lake smell terrible?
------ Because large quantities of water _________.
A．have been pollutedB．has polluted
C．have pollutedD．has been polluted
A
考查主謂一致與語態(tài)。large quantities of +名詞作主語，位于動(dòng)詞用復(fù)數(shù)；water與pollute構(gòu)成被動(dòng)的關(guān)系。所以選擇A。
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