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(lái)灌溉田地．

解答 答案：A
Large quantities of做主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞根據(jù)quantities來(lái)選擇，用復(fù)數(shù)形式，a quantity of做主語(yǔ)時(shí)，謂語(yǔ)根據(jù)of后的名詞來(lái)判斷．再根據(jù)句意，水是被需要的，故用被動(dòng)語(yǔ)態(tài)．

點(diǎn)評(píng) 考察主謂一致．a(chǎn) quantity of 做主語(yǔ)時(shí)，謂語(yǔ)需根據(jù)of后名詞來(lái)判斷，quantities of 做主語(yǔ)時(shí)，謂語(yǔ)需用復(fù)數(shù)形式．

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