How long before did he join the army?改错.

How long before did he join the army?改错. How long before did he join the army?改错 by the way,how long did you live with your bf before?翻译, How long did you study before you qualified.为什么不是have you studied? How did Thanksgiving originate before? How did Christmas originate before? -How long did you wait me?-___he came back at 10.A.until B.after C.before 为什么选A? ____ they read the book before?参考答案填Have,那么填How long did 为什么不可以呢 how long did his family live in new york before he was five years old这句话对吗,还是用how soon,这两个疑问词有什么区别 How long did it take you____your homework? How long ago did you start school? how,spend,did,there,long,you(?) How long did the English exam last How long did you stay there? how long did you ____ it how long did you stay in Beijing? How long did you____in Shenzhen?There days how long did you stay there?能否改为 how long did you stay at there?