问题补充:
--- do you go hiking?
--- Once a week.
A. How many times
B. How often
C. How long
D. How soon
答案:
A. How many times
(答案→)B. How often
C. How long
D. How soon
解析:How many times多少次;How often多久一次;How long多长;How soon多久。根据下文,每周一次。可知上文提问的是频率,故选B,你多久去远足一次?