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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 297

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

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