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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1286

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