— do you clean the classroom?— Three times a day.A. How longB. How oftenC. How soonD. How

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。