问题补充：
— do you walk your dog?
—Sometimes.
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：
试题分析: 句意：你多久遛狗一次？有时。How many times几次，How often多久一次，How long多久， How soon多久；根据Sometimes.有时，可知是问频率多久一次，故选B.
