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    6．I really don't know if she_____ it when she_____．（　　）
    A．finds，arrivesB．finds，will arrive
    C．will find，will arriveD．will find，arrives

    分析 我真的不知道当她到了的时候她是否能找到．

    解答 答案：D．if引导的是宾语从句，主句是一般现在时，从句时态不受限制，when引导的时间状语从句，遵循主将从现的规则，从句主语she，故arrives，故答案是D．

    点评 在时间、条件状语从句中，主句用一般将来时，从句要用一般现在时代替一般将来时．
    例如：
    I will let you know if he comes．
    We will inform him when he gets here．

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