问题补充：
--- do you help your mother clean the house?
--- Once a week.
A. How far
B. How long
C. How soon
D. How often
答案：
A. How far
B. How long
C. How soon
(答案→)D. How often
解析：本题的回答语表示的是频率，对此提问用how often，故本题选D。
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