Question

______do you go swimming ?   Sometimes.

1. A.
   How often
2. B.
   How long
3. C.
   how many
4. D.
   How old

Answer 1

A
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。