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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 --我經常把吉姆誤認為鮑勃．你能區分他們嗎？
--不能．他們看起來是如此地相像．

解答 答案：D．
can 表示能力；must必須，應該，一定，準是；may表示允許、許可，May I…征詢對方許可．shall 1．用于第一、第三人稱疑問句中，征求對方的意見和向對方請示．2．用于第二、第三人稱陳述句中，表示說給對方的命令、決心、警告、允諾或威脅等3．用在條約、規章、法令等文件中表示義務或規定，一般用于第三人稱．結合句意"--我經常把吉姆誤認為鮑勃．你能區分他們嗎？--不能．他們看起來是如此地相像．"可知，這里表示能力，故選D．

點評 本題考查情態動詞的用法．要理解句意，掌握好各個情態動詞的用法．充分利用語境，注意分清各個情態動詞適用的句型，得出答案．

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