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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1650

When the teacher came into the classroom, all of us __________ the classroom.
A. are cleaning   
B. were cleaning   
C. cleaned
D are  cleaned

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Whentheteachercameintotheclass