–does her uncle surf the Internet? – Once a day.A. How longB. How soonC. How oftenD. How

问题补充：

–does her uncle surf the Internet? – Once a day.

A. How long

B. How soon

C. How often

D. How much

答案：

A. How long

B. How soon

(答案→)C. How often

D. How much

解析：How long多长；How soon 多久；How often多久一次；How much多少，对钱等不可数名词进行提问；根据答语，每天一次，可知选C。