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    – May I have an apple, Mum? --Certainly. But you wash your hands first? A. may B. must C. can D. need 【查看更多】

     

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    　　May I have an apple, Mum?

    　　Certainly. But you ________ wash your hands first.

    [　　]

    A．may
    B．must
    C．can
    D．need

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