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:A. How often多久一次,表示频率;B. How long 多长时间或是距离 ;C. How many多少,修饰可数名词的复数形式;D. How old多少岁,询问年龄;句意:你多长时间游一次泳?有时。故选A.