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4.Large quantities of water _________ water the fields.(  )
A.are needed toB.is needed toC.are needed forD.is needed for

分析 需要大量的水来灌溉田地.

解答 答案:A
Large quantities of做主语时,谓语动词根据quantities来选择,用复数形式,a quantity of做主语时,谓语根据of后的名词来判断.再根据句意,水是被需要的,故用被动语态.

点评 考察主谓一致.a quantity of 做主语时,谓语需根据of后名词来判断,quantities of 做主语时,谓语需用复数形式.

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