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    精英家教网 > 高中英语 > 题目详情
    -Why does the Lake smell terrible?
    -Because large quantities of water__________.
    A．have pollutedB．is being pollutedC．has been pollutedD．have been polluted
    D
    考查动词时态，语态和主谓语一致。根据前一分句可知所填动词表示过去发生的动作对现在产生的影响，时态用现在完成时，动词与主语是被动关系，用被动语态。主语是large quantities of water，其中心词是quantities，是复数，谓语动词用复数，选D。
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