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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 【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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