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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
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四、it类
. 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
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四、it类.Everyoneknowsthatisdange