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    Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
    A．it, itB．what, what
    C．it, whatD．what, it
    C
    考查固定句型主语从句。It is+形容词+to do sth.“做某事是......的。”_______ is difficult作主语，主语从句缺少主语，用what。故选C。
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