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    精英家教网 > 高中英语 > 题目详情
    --Why does the river smell terrible?
    --Because large quantities of water__________.
    A．have polluted B．is being pollutedC．has been pollutedD．have been polluted
    Ｄ
    考察主谓一致。large quantities of 放在句首，谓语动词永远都使用复数形式，根据句意可知是被动一意思，故D正确。
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