问题补充：
--- do you go shopping?
---- Twice a week.
A. How long
B. How often
C. How far
D. How
答案：
A. How long
(答案→)B. How often
C. How far
D. How
解析：此题重点考查特殊疑问词辨析，how long多久对一段时间进行提问；how often对频率进行提问，how far多远，对距离进行提问；how对方式进行提问；根据答语故选B
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