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    23．The telephone four times in the last twenty minutes.and each time it for my roommate. A．rang; has been B．has been ringing; is C．had rung; was D．has rung; was 【查看更多】

     

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    The telephone____four times in the last twenty minutes，and each time it___for my roommate.

    A．rang；has been           B．has been ringing；is

    C．had rung；was            D．has rung；was

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