- do you help your mother cook?-Once a week.A. How long B. How C. How often

发布时间：2020-08-20 19:44:55

----      do you help your mother cook?
---- Once a week.
A. How long     B. How      C. How often

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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C。
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