问题补充:
--- English classes do you have every week?
--- Five.
A. How often
B. How long
C. How much
D. How many
答案:
A. How often
B. How long
C. How much
(答案→)D. How many
解析:疑问词辨析。How often多久一次;How long多长;How much多少钱; How many多少个。根据答语可知询问的是数量,故用how many。选D。