问题补充:
---does your mother watch the Talk show? ---Once a week.
A. How long
B. How often
C. How soon
D. How many
答案:
A. How long
(答案→)B. How often
C. How soon
D. How many
解析:句意:你妈妈多久看一次脱口秀节目?一周一次。提问做某事的频率用how often;how long表示多久,多长时间;how soon表示多快,要过多久以后;how many表示多少,强调数量;根据下文Once a week,可知提问的是频率,故选B。