问题
选择题
--You speak English so well. ______ have you learned English?
--For 5 years.
A．How many
B．How long
C．How often
D．How far
答案
答案：B
疑问词辨析。How many多少个； How long多长； How often 多久一次； How far多远。根据答语可知询问的是一段时间，故选how long。选B。