_______ entering the classroom, remember to take your seat and turn off your cell phone.
A．AtB．FromC．UponD．As
C
本題考查介詞辨析。介詞 on/upon后跟 V-ing 形式作“在……時；一……就……”講，相當(dāng)于 as soon as 引導(dǎo)的狀語從句。
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