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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
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If we had taken such effective measures much earlier, the river          so seriously now.

A.is not polluted B.would not be polluted
C.had not been polluted D.would not have been polluted
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Ifwehadtakensucheffectivemeasu