_____entering the classroom, remember to take your seat and turn off your cell phone.
A．AtB．FromC．UponD．As
C

試題分析：句意：一進(jìn)入教室，記得坐下關(guān)掉手機(jī)。Upon+名詞或動(dòng)名詞，表示“一…”，at“在…地方，聽見…”，from“來自”，As“做為”，所以選C。
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