2. 公务员
  3. Everyone knows that______ is dangerous to play with fire, but______ is difficult is to prevent children from playing with fire.

Everyone knows that______ is dangerous to play with fire, but______ is difficult is to prevent children from playing with fire.

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问题 Everyone knows that______ is dangerous to play with fire, but______ is difficult is to prevent children from playing with fire.
选项 A、it; it
B、what; what
C、it; what
D、what; it
答案C
解析 考查名词性从句。前半句是由that引导的宾语从句，it作从句中的形式主语，真正的主语是其后的不定式to play with fire；后半句是由what引导的主语从句并在从句中做主语。句意为“所有人都知道玩火危险，但是真正困难的是如何阻止孩子玩火”。
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