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题文

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
科目 英语   题型 单选题   难度 中等
知识点: 与数量有关的代词和限定词 主语从句综合
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