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    精英家教网 > 高中英语 > 题目详情
    The new system needs to be in operation for five months ________ it can be updated.
    A．asB．while
    C．beforeD．once
    C
    C考察状语从句。本句的before用语肯定句中，强调主句动作持续的时间比较长，意为：要多多久….才。故C正确。
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