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13、―Where is Michael? I cannot find him anywhere.  

―He ______ have been off long. I saw him study in the room just now.  

A.shouldn't                 B.can't             C.mustn't           D.needn't  

13、B

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―Where is Michael? I cannot find him anywhere.  

―He ______ have been off long. I saw him study in the room just now.  

A.shouldn't                 B.can't             C.mustn't           D.needn't  

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