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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 609

Police were sent out to keep the traffic ________ smoothly during the snowstorm.



A.being run
B.run
C.to run
D.running
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Policeweresentouttokeepthetraf