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    We were having a meeting someone knocked at the door. A. because B. when C. as D. while 【查看更多】

     

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    We were having a meeting _________ suddenly someone knocked at the door.

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

     

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    We were having a meeting ______ suddenly someone knocked at the door.

    [     ]

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

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