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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