Only when __________________ permission _______________ allowed to enter the lab.A．a teacher has given; are the studentsB．has a teacher given; are the student-高中英语-n多题

◎ 题干

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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