摘要： 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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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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