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【题目】Only if a teacher gives permission _________ to enter the room.

A.a student is allowedB.is a student allowed

C.does a student allowD.a student allowed

【答案】B

【解析】

考查部分倒装。句意:只有得到老师的允许,学生才能进入那个房间。“only+状语/状语从句”位于句首时,句子的主语和谓语或主句中的主语和谓语要部分倒装。本句为一般现在时的被动语态,故应将be动词is提前到主语a student之前。故选B

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