【題目】Please turn off the light ________ you leave the classroom.

A. unlessB. whileC. beforeD. after

【答案】C

【解析】

句意：離開教室前請把燈關(guān)掉。A. unless除非；B. while當(dāng)……的時候； C. before在……之前；D. after在……之后。結(jié)合本題的語境可知，是在離開教室前把燈關(guān)掉。故選C。

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