–Peter do you visit your grandparents?Twice a month.A. how oftenB. how soonC. how far

问题补充：

–Peter, do you visit your grandparents? --Twice a month.

A. how often

B. how soon

C. how far

D. how long

答案：

(答案→)A. how often

B. how soon

C. how far

D. how long

解析：本题的回答语表示的是频率，对此提问用how often，故本题选A。