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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 776

—Why do you look so tired?
—Because we ________ for three hours without stopping.

A.work B.worked
C.have worked D.were working
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—Whydoyoulooksotired?—Becausew