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  • 更新 2022-09-04
  • 科目 英语
  • 题型 选择题
  • 难度 中等
  • 浏览 54

By the time the teacher came, we ______ cleaning the classroom.(  )

A.

finished

B.

have finished

C.

had finished

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Bythetimetheteachercame,weclea