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  • 更新 2022-09-04
  • 科目 英语
  • 题型 选择题
  • 难度 中等
  • 浏览 45

John _______ so hard on his project that he didn't notice his mom enter the room.(  )

A.worksB.has worked

C.was workingD.will work

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Johnsohardonhisprojectthathedi