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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

试题分析:考查主谓一致。本题属于主谓一致里特殊用法large quantities of的后面既可以接可数名词也可以接不可数名词,谓语动词都使用复数形式。句意:—为什么这个湖闻起来很臭?—因为大量的水都已经被污染了。根据句意说明使用被动语态。而且是已经被污染了,也要使用现在完成时的形式。故D正确。
点评:特殊的考查点:large quantities of的后面既可以接可数名词也可以接不可数名词,谓语动词都使用复数形式。
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