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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 been pollutedB．is being polluted
    C．has been pollutedD．have polluted
    A

    试题分析：“受到污染”即“被污染”应该用被动语态，故排除D选项。“河水被污染”已经造成后果，故用现在完成时，所以排除B选项。large quantities of water中是large quantities作主语，故谓语动词用复数形式。选项A 正确。句意：——这条河的河水为什么发臭啊？——因为大量的河水被污染了。
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