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

分析 需要大量的水來灌溉田地.

解答 答案:A
Large quantities of做主語時,謂語動詞根據(jù)quantities來選擇,用復數(shù)形式,a quantity of做主語時,謂語根據(jù)of后的名詞來判斷.再根據(jù)句意,水是被需要的,故用被動語態(tài).

點評 考察主謂一致.a(chǎn) quantity of 做主語時,謂語需根據(jù)of后名詞來判斷,quantities of 做主語時,謂語需用復數(shù)形式.

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