do you go swimming ? Sometimes.A. How oftenB. How longC. how manyD. How old

问题补充：

do you go swimming ? Sometimes.

A. How often

B. How long

C. how many

D. How old

答案：

(答案→)A. How often

B. How long

C. how many

D. How old

解析：考查对动作发生的频率提问以及特殊疑问词的区别，how often多久一次、how long多长时间、how many 多少、how old多大，根据答语， 故选A。