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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 841

The smelly water has been found_______ and no longer usable until the chemicals and wastes are removed from it.

A.to be polluted B.having polluted
C.polluting D.polluted
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Thesmellywaterhasbeenfoundandn