- do you play football?-- Once a week.A. How longB. How soonC. How oftenD. How

问题补充：

---- do you play football?

---- Once a week.

A. How long

B. How soon

C. How often

D. How

答案：

A. How long

B. How soon

(答案→)C. How often

D. How

解析：

试题分析: 句意：你多久踢一次足球？一周一次。 How long多久， How soon多久，How often 多久一次，How 怎样。根据 Once a week一周一次，可知问的是多久一次，故选C。