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    The light is still on. Our teacher our exam papers. A. must be graded B. must grade C. must be grading D. must have graded 【查看更多】

     

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    The light is still on. They ___ to turn it off when they left the room.

          A. must forget            B. could have forgotten

    C. may forget             D. must have forgotten

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    The light is still on. They ___ to turn it off when they left the room.

        A. must forget            B. could have forgotten

        C. may forget             D. must have forgotten

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    The light is still on. He _____ to turn it off when he _____ the room.

    A．may forget: leave

    B．must have forgotten : left

    C．may forget : have left

    D．could have forgotten : left

     

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    The light is still on. They ___ to turn it off when they left the room.

    A．must forget

    B．could have forgotten

    C．may forget

    D．must have forgotten

     

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    Our teacher _______ at the office, for the light is still on.

    　 A. must work　　　　　 B. must have done

    　 C. must be working　　 D. is working

     

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