-Why does the Lake smell terrible? 
-Because large quantities of water       .  
A．have pollutedB．is being pollutedC．has been pollutedD．have been polluted
D
考查動詞時態(tài)，語態(tài)和主謂語一致。根據(jù)前一分句可知所填動詞表示過去發(fā)生的動作對現(xiàn)在產(chǎn)生的影響，時態(tài)用現(xiàn)在完成時，動詞與主語是被動關(guān)系，用被動語態(tài)。主語是large quantities of water，其中心詞是quantities，是復(fù)數(shù)，謂語動詞用復(fù)數(shù)，選D。
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