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    I had not been reading for half an hour I heard steps outside. A. while B. when C. if D. unless 【查看更多】

     

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    I had not been reading for half an hour        I heard steps outside.

    A. while                       B. as                            C. when                       D. since

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    I had not been reading for half an hour _____ I heard the steps outside.

    A．when

    B．while

    C．as

    D．since

     

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    I had not been reading for half an hour _____ I heard the steps outside.

        A. when                     B. while              C. as                          D. since

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