【題目】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引導的狀語從句放在句首時，主句用部分倒裝。be allowed to do被允許做……。句意：只有得到老師的許可，學生才允許進入房間。根據(jù)句意，故選B。

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