问题补充:
--do you go to the English club?
--Once a week.
A. How old
B. How often
C. How much
D. How many
答案:
A. How old
(答案→)B. How often
C. How much
D. How many
解析:词义辨析 how old多大年龄; how often 多久一次; how much多少(修饰不可数名词),多少钱; how many多少(修饰可数名词)。根据答语每周一次,故选B。