_______ entering the classroom, remember to take your seat and turn off your cel
题型：不详难度：来源：
_______ entering the classroom, remember to take your seat and turn off your cell phone.
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答案
| C |
解析
| 本题考查介词辨析。介词 on/upon后跟 V-ing 形式作“在……时；一……就……”讲，相当于 as soon as 引导的状语从句。 |
举一反三
This year my brother made a little progress in his study, but _____, it’s been an unlucky year for him.| A．first of all | B．all in all | C．in all | D．as a consequence |
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The winner of the Grand Slams said that he had owed his success to many people, his parents_________. | A．after all | B．by chance | | C．on purpose | D．in particular |
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The government has made many laws ______ the people’s interests. | A．in favor of | B．in celebration of | | C．in charge of | D．in front of |
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If you let pressure benefit ________upset you，much more can be accomplished than you thought possible.| A．more than | B．rather than | C．other than | D．less than |
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People try to avoid public transportation delays by using their own cars, and this ______ creates further problems.| A．in return | B．in case | C．in addition | D．in turn |
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