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19.Why do some rich people steal things ____ they could easily afford to buy them?(  )
A.unlessB.beforeC.ifD.when

分析 一些有钱人明明可以轻松掏钱买东西,为什么他们偏偏要偷呢?

解答 答案:D
题干中they could easily afford to buy them使用了情态动词could,这是一种特殊的虚拟,用来表达遗憾,意思是:本来…却….when引导状语从句,表达对比的含义.故选D.

点评 从属连词是连词的一种,用来引导名词性从句和状语从句.大致可分为三大类:that(无词义,不做成分)if,whether (表达是否的意义,但不做句子成分); 连接代词:who,whom,whose,what,which,whatever,whoever,whichever(有词义,在句子中可作主语、表语、宾语);连接副词:when,where,why,how,how many,how long,how far,however,whenever,wherever (有词义,作从句的状语).学习时,要注意区分和掌握.

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