问题补充：
— have you been away from your hometown, Jane?
— Since twelve years ago.
A. Howmany
B. Howlong
C. Howmuch
D. Howoften
答案：
A. Howmany
(答案→)B. Howlong
C. Howmuch
D. Howoften
解析：Howmany多少个;Howlong多长;Howmuch多少钱;Howoften多久一次.根据下文,自从十二年前.可知上文提问的是时间长短,故选B.简,你离开家乡多久了?
