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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 880

—Why does the lake smell terrible?
—Because large quantities of water _____.

A.have polluted. B.is being polluted.
C.has been polluted. D.have been polluted.
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—Whydoesthelakesmellterrible?—