On is Ok in your case?

 

¹on /ˈɑ:n/ preposition

15 — used to indicate an activity that someone did or is now doing ▪ She did well on the exam/test. ▪ The band is currently on tour. ▪ He is off/away on a trip/vacation. ▪ She is on a diet. ▪ The officers are on duty.

 

URL: http://www.learnersdictionary.com/search/on

 

 

 

 

 

 

所有跟帖： 

• 不知道啊，别人都用at，找到用在ceremony的前的都是用的at -jennea- ♀ (0 bytes) () 09/14/2011 postreply 19:47:06

• 我也只找到短语 "stand on ceremony"。 -EnLearner- ♀ (0 bytes) () 09/14/2011 postreply 19:55:19

• dict.cn 上查ceremony -jennea- ♀ (328 bytes) () 09/14/2011 postreply 20:06:28

• "stand on ceremony" 在"On Etiquette"那一课里就有了。 -EnLearner- ♀ (0 bytes) () 09/14/2011 postreply 20:19:55

• 那时没意识到还可以做 “别客气” 讲。 虽说日常生活没听过。 -jennea- ♀ (63 bytes) () 09/14/2011 postreply 20:27:20

• 吃，吃，　吃。。。 lol -EnLearner- ♀ (0 bytes) () 09/14/2011 postreply 20:31:27