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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1975

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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Everyoneknowsthatisdangerousto