— does your father wash his car?
—Once a week.
A. How much
B. How often
C. How many
D. How long
网友回答
A. How much
(答案→)B. How often
C. How many
D. How long
解析：A. How much多少，修饰不可数名词 B. How often多久一次，询问频率 C. How many多少，修饰可数名词的复数形式 D. How long多长时间，句意：你的父亲多久洗一次车。一周一次。故选B