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    17．The telephone three times in the past twenty minutes, and each time it for my roommate. A．rang; was B．has rung ;was C．rang; is D．has rung; is 【查看更多】

     

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    The telephone ______ three times in the past twenty minutes, and each time it _____ for my roommate.

    A. rang; was      B. has rung; was       C. rang; is             D. has rung; is

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