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


  1. A.
    At
  2. B.
    From
  3. C.
    Upon
  4. D.
    As
C
解析:
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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