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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较难
  • 浏览 1081

________ is known to all is that effective measures should be taken to deal with the problem of the overexploitation of our resources.

A.What B.It
C.As D.Which
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isknowntoallisthateffectivemea