－Why does the river smell terrible?－Because large quantities of waterA. have been pollute

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(答案→)A. have been polluted
B. is being polluted
C. has been polluted
D. have polluted
解析：“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。