问题补充:
---How long is it we last met?
--- About five years. You haven’t changed much.
A. before
B. since
C. when
D. that
答案:
A. before
(答案→)B. since
C. when
D. that
解析:连词辨析。Before在……之前;since自……以来;when当……时候;that,那个引导限制性定语从句。根据题意,根据下文,大约五年了,你没多大变化。可知上文要表达的意思是,自从我们上次见面有多久了?故选B。