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    精英家教网 > 初中英语 > 题目详情
    Mr Green was watching TV ______ someone knocked at the door.

    A. while
    B. when
    C. since
    D. after
    B
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    科目：初中英语 来源：期中题 题型：单选题

    Mr Green was watching TV ______ someone knocked at the door.
    [     ]
    A. while
    B. when
    C. since
    D. after

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