问题补充：
—__ a week does Tom go to the club ? — Once a week.
A. How often
B. How soon
C. How many times
D. How long
答案：
A. How often
B. How soon
(答案→)C. How many times
D. How long
解析：根据答语内容Once a week.，可知回答为频率，后文有week，说明用次数，故选答案为C
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