It will be three years ____we meet again .在这里为什么不能用until 儿要用before?

It will be three years before we meet again. 英语翻译还有It will be three years before he graduated. it will be will It was three o'clock ten minutes ago.What will it be an hour's time? I know a word of three letters,add two,it will be fewer. what is it? it is one to one,what time will it be in three minutes? know a word of three letters,add two,it will be fewer.what is it? It will take three hours. my age today is three times what it will be three years from now minus three times what my age was three years ago.how old am It will be about three weeks____he cones back.A.after B.until C.since D.before It will be three years ____we meet again .在这里为什么不能用until 儿要用before? Someday,it will be. when will it be It will be much it will be said it will be said it will be It will be on...