a commercial aired on television

a commercial aired on television commercial commercial用法he is appearing ______ for a sports productsat a commercial,还是on a commercial两个有何区别?（这个回答的话追加分～） a multi-million dollar contract shooting a tv commercial!shooting What dose well-aired mean? I want to become a commercial assassin是什么意思 a Signed commercial invoice in 3 originals是什么意思 I've already aired the room this morning.i've already aired the room in the morning.这两种表示哪种可以?是不是现在完成时不能用具体的时间状语比如 in the morning ,at 7 o'clock 但是可以用 this morning ,since 7 o'clock? commercial是什么意思? commercial是什么意思 commercial viability commercial advocacy commercial proposal television commercial commercial enterprises air的过去式是aired还是原形 will be aired this coming Monday Hasn't anyone aired this room yet?