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    Last Sunday they reached Qingdao, a conference was to be held. A. which B. that C. when D. where 【查看更多】

     

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    Last Sunday they reached Qingdao, ________ a conference was to be held．

    [　　]
    A．

    which

    B．

    that

    C．

    when

    D．

    where

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