--do you go to the English club?--Once a week.A. How oldB. How oftenC. How muchD. How many

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。