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—Why does the lake smell terrible?
—Because large quantities of water_______________.
A.have pollutedB.is being polluted
C.has been pollutedD.have been polluted
D
D解析:本题将主谓一致和语态两个考点一起考查。large quantities修饰名词作主语时,谓语动词用复数,water和pollute之间是被动关系,故正确答案为D。
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