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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 563

______ in the queue for half an hour, the old man suddenly realized he had left the check in the car.

A.Waiting B.To wait
C.Having waited D.To have waited
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inthequeueforhalfanhour,theold