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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1008

In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.

A.has tried B.has been tried C.have taken D.have been taken
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Inordertokeepthebalanceofecosy