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    精英家教网 > 初中英语 > 题目详情
    We stayed at the lab ___ our teacher returned.

    A. till
    B. by
    C. during
    D. while
    A
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    科目：初中英语 来源：专项题 题型：单选题

    We stayed at the lab ___ our teacher returned.
    [     ]
    A. till
    B. by
    C. during
    D. while

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