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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 195

Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.

A.it; what B.what; what C.what; it D.it; it
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Everyoneknowsthatisdangerousto