Only when __________________ permission _______________ allowed to enter the lab.
A．a(chǎn) teacher has given; are the studentsB．has a teacher given; are the students.
C．has a teacher given; the students areD．a(chǎn) teacher has given; the students are
A
only 引導(dǎo)的狀語從句放句首時，主句要倒裝。
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