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    Mary knows a lot about China. She there. A. must be B. must have gone C. must have been D. can have been 【查看更多】

     

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    Mary knows a lot about China. She________there.

    A. must be 　　　　　　　　　　　　　　　　　　   B. must have gone

    C. must have been 　　　　　　　　　　　　　　　　   D. can have been

     

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    Mary knows a lot about China. She________there.

    A. must be 　　　　　　　　　　　　　　　　　　   B. must have gone

    C. must have been 　　　　　　　　　　　　　　　　   D. can have been

     

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    Mary knows a lot about China. She ________ there.

    [　　]

    A．must be
    B．must have gone
    C．must have been
    D．can have been

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