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    -Look! The lights in the teachers’ office are still on. Is Mr. Li working? -No. It be Mr. Li. I saw him leave just now. A. may not B. mustn’t C. can’t D. needn’t 【查看更多】

     

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    —Look! The lights in the teachers' office are still on. Is Mr. Li working?
    —No. It _______ be Mr. Li. I saw him leave just now.
    [     ]
    A. may not
    B. mustn't
    C. can't
    D. needn't

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    —Look! The lights in the teachers’ office are still on. Is Mr. Li working?

    —No. It _______ be Mr. Li. I saw him leave just now.

    A．may not                  B．mustn’t                   C．can’t                   D．needn’t

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