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    I when you rang me up last night. A. must be sleeping B. must have slept C. must have been sleeping D. must have been slept 【查看更多】

     

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    I ________ when you rang me up last night.

    [　　]

    A．must be sleeping
    B．must have slept
    C．must have been sleeping
    D．must have been slept

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