【題目】________a teacher has given permission is a student allowed to enter the classroom.

A. If only B. Only if

C. As if D. Even if

【答案】B

【解析】考查狀語從句。if only意為“只要，若要……就好了”；as if意為“好像”；even if意為“即使”；only if意為“只有”，通常位于句首。從句意和句子的結構可知本題正確答案為B。

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