－ do you go to Old People’s Home?－Twice a month. A. How longB. How soonC. How often D. How

问题补充：

－ do you go to Old People’s Home?

－Twice a month.

A. How long

B. How soon

C. How often

D. How many times

答案：

A. How long

B. How soon

(答案→)C. How often

D. How many times

解析：How long多长；How soon多久；How often多久一次；How many times多少次。根据下文，一个月两次。可知上文提问频率，故选Ｃ。