this was a custom among the ancients这里介词用到among among是表示三者以上之间 为什么这里用这个介词,用in 可以吗

this was a custom among the ancients这里介词用到among among是表示三者以上之间 为什么这里用这个介词,用in 可以吗 英语：Where____you this moring?l___at a meeting.A.were,was B.are.am C.do,am I am looking for a company that can product custom leather belts总是看到这个custom or customing this app is only a custom cgroups configfile.this windows does nothing.nothing to see here. This was a custom among the ancients 这是古代人得一种习俗.请问这句话中的among有什么用.among 是在什么之中的意思 跟句意不搭配啊 请问The activator is a custom design which is made specially for this purpose. where()you this morning?-I()at home怎么填?A.were was B.are amC.do am D.are was If this was a custom My teacher asked me ( ) late for school this morning A Why was I B Why I was C Why am I D why i am 为什么不是d?/ This is the first time I____a baseball game?A.am watching B.was watching C.have watchedD.will watch i am w____ why he was late this morning . I was never worried about this.为什么不是I am never worried about this.什么时候用am 什么时候用was I was the only person wearing the custom其中的wearing the custom是什么结构 需要有解释.1 He was very rude to the Custom officer,___of course made things even worse.A who B whom C what D which2 Is this the factory____you visited the other day?A that B where C in which D the one3 China has thousands of islands.___Hainan I Once a use,forever a custom 英语翻译The market trend within the jewelry industry is a movement toward custom,unique pieces as well as limited production items.This trend is in response to the climate of the industry in the mid-nineties where the jewelry market was flooded w What were you doing this time yesterday?-I on the grass and drawing a picture.A.sit B.sat C.am sitting D.was sitting