On is Ok in your case?

來源: 2011-09-14 19:27:52 [博客] [舊帖] [給我悄悄話] 本文已被閱讀:

 

1on Listen to audio/ˈɑ:n/ preposition

15used 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.