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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较难
  • 浏览 1996

_________ is a growing world problem, and nowadays the United Nations and its member countries _________hard to deal with it.

A.Desertification; are working B.Desertified ; worked
C.Desert; work D.Desertification; have worked
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isagrowingworldproblem,andnowa