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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 248

------ Why does the lake smell terrible?
------ Because large quantities of water _________.

A.have been polluted B.has polluted
C.have polluted D.has been polluted
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Whydoesthelakesmellterrible?Be