题目内容
【题目】Only if a teacher gives permission ________.
A.a student did allow to enter the room
B.is a student allowed to enter the room
C.did a student allow to enter the room
D.a student is allowed to enter the room
【答案】B
【解析】only if引导的状语从句放在句首时,主句用部分倒装。be allowed to do被允许做……。句意:只有得到老师的许可,学生才允许进入房间。根据句意,故选B。
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