— do you have PE lessons?— Three times a weekA. How longB. How soonC. How many D. How oft

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：How long多长；How soon多久；How many多少；How often多久一次。结合下文一周三次。可知上文是对频度进行提问，故选D。