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    I was about to leave the office an unexpected visitor came. A. while B. as C. when D. before 【查看更多】

     

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    I was about to leave the office ______ an unexpected visitor came.

    A. while             B. as              C when            D. before

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     I was about to leave the office ______ an unexpected visitor came.

    A. while             B. as              C when            D. before

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    I was about to leave the office ______ an unexpected visitor came.

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

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