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
考查固定句型主語(yǔ)從句。It is+形容詞+to do sth.“做某事是......的。”_______ is difficult作主語(yǔ)，主語(yǔ)從句缺少主語(yǔ)，用what。故選C。
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