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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 521

—You seem tired, David.
—Yes. I _____ all day long and can’t wait to go to bed now.

A.am working B.had been working
C.have been working D.was working
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—Youseemtired,David.—Yes.Ialld