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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 2118

The air pollution of the city ____ by 20 percent thanks to the strict measures taken by the   government.

A.has been fallen down B.has been increased
C.has been reduced D.has been risen
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Theairpollutionofthecityby20pe