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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1767

______ around the clock for two days,David managed to finish the report for the manager on schedule.

A.Working B.Worked
C.Having worked D.To work
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aroundtheclockfortwodays,David