— does your mother go for a walk？ —Every afternoon.A. How longB. How oftenC. How muchD. Ho

问题补充：

— does your mother go for a walk？ —Every afternoon.

A. How long

B. How often

C. How much

D. How many

答案：

A. How long

(答案→)B. How often

C. How much

D. How many

解析：句意：——你母亲多久去散步一次？——每天下午。A、How long 多长时间，询问时间长短的。 B、How often 多久，询问频率的； C、How much多少，询问价钱的； D、How 多少，询问数量的。根据Every afternoon可知是询问频率，故选B。