问题补充:
--do you have PE lessons?
--Three times a week.
A. How long
B. How soon
C. How many
D. How often
答案:
A. How long
B. How soon
C. How many
(答案→)D. How often
解析:考查疑问词。How long多长; How soon多久; How many多少个;How often多久一次。根据答语的内容Three times a week.为一周三次,可知上文提问频率的,故选D