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    --I can’t find Dad. Where is he? --I’m not sure. He be in the study. A. must B. may C. need D. will 【查看更多】

     

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    — I can't find Dad. Where is he? 
    — I'm not sure. He            be in the study room.
    [     ]
    A. must
    B. may
    C. need

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