—— do you have this kind of match? —— Once a year.A. How longB. How oftenC. How manyD. Ho

问题补充：

—— do you have this kind of match? —— Once a year.

A. How long

B. How often

C. How many

D. How much

答案：

A. How long

(答案→)B. How often

C. How many

D. How much

解析：How long多长；How often多久一次；How many多少个；How much多少。根据答语，每年一次。可知上文提问频率，故选B。