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    20． ?Another cup of coffee? -No, thanks． I be off． Mary is waiting for me．A． can B． may C． must D． might 【查看更多】

     

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    –Another cup of coffee?

    –No, thanks．I _____ be off．Mary is waiting for me．

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

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    －Another cup of coffee?

    －No, thanks．I ________ be off．Mary is waiting for me．

    [　　]

    A．can

    B．may

    C．must

    D．might

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