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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
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【2015·陕西】Mary      really hard on his book and thinks he’ll have finished it by Friday.

A.worked B.has been working C.had worked D.has worked
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【2015·陕西】Maryreallyhardonhisbo