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    5．Has it ever occurred to you ______ you would become a dentist one day？（　　）
    A．thatB．whatC．whichD．when

    分析 你有没有想到过有一天当医生？

    解答 答案：A
    本题考查的是连词用法．that连接代词；what什么；which哪一个；when何时．题干中，that连接从句作真实主语，that引导主语从句时不充当成分，不可以省略，不含有词意．故选A．

    点评 复合句中连词的用法比较灵活，在解题时要注意区分从句类型，连接词在不同从句中的用法是有区别的．

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