——does your mother watch the Talk Show? ——Once a week.A. How longB. How oftenC. How soonD.

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 much

答案：

A. How long

(答案→)B. How often

C. How soon

D. How much

解析：句意：你妈妈多久看一次脱口秀？一周一次。A多长；B多久一次；C多快；D多少；结合语境选B。