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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 325

Only when __________________ permission _______________ allowed to enter the lab.

A.a teacher has given; are the students B.has a teacher given; are the students.
C.has a teacher given; the students are D.a teacher has given; the students are
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Onlywhenpermissionallowedtoent