问题补充：
— do you clean the classroom?
— Three times a day.
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：
试题分析:根据答语three times a day可知询问的是频率，故用how often来提问，故选B。
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