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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, it B．what, what C．it, what D．what, it

    C

    解析试题分析：考查it做形式主语和主语从句的用法：句意：每个人都知道玩火是危险的，但是很难阻止孩子玩火。第一空填形式主语真正的主语是其后的不定式 to play with fire而第二空应填 whatwhat is difficult 是主语从句注意 what is difficult 后的谓语动词是is。选C
    考点：考查it做形式主语和主语从句的用法

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