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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1149

— Why is the chemical plant closed?
— Because large quantities of waste water ______ into the Yangtze River.

A.has been released B.is being released
C.was released D.have been released
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—Whyisthechemicalplantclosed?—