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    I hurried to answer the telephone and it was Mabel, who had been one of my best friends we were at primary school. A. while B. when C. after D. since 【查看更多】

     

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    I hurried to answer the telephone and it was Mabel, who had been one of my best friends ________ we were at primary school．

    [　　]

    A．while

    B．when

    C．after

    D．since

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