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_____entering the classroom, remember to take your seat and turn off your cell phone.

A.At B.From C.Upon D.As

C

解析试题分析:句意:一进入教室,记得坐下关掉手机。Upon+名词或动名词,表示“一…”,at“在…地方,听见…”,from“来自”,As“做为”,所以选C。
考点:考查介词辨析

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