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19.-I often mistake Jim for Bob.______ you tell them apart?
-No.They look so much alike.(  )
A.MustB.ShallC.MayD.Can

分析 --我经常把吉姆误认为鲍勃.你能区分他们吗?
--不能.他们看起来是如此地相像.

解答 答案:D.
can 表示能力;must必须,应该,一定,准是;may表示允许、许可,May I…征询对方许可.shall 1.用于第一、第三人称疑问句中,征求对方的意见和向对方请示.2.用于第二、第三人称陈述句中,表示说给对方的命令、决心、警告、允诺或威胁等3.用在条约、规章、法令等文件中表示义务或规定,一般用于第三人称.结合句意"--我经常把吉姆误认为鲍勃.你能区分他们吗?--不能.他们看起来是如此地相像."可知,这里表示能力,故选D.

点评 本题考查情态动词的用法.要理解句意,掌握好各个情态动词的用法.充分利用语境,注意分清各个情态动词适用的句型,得出答案.

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