—do you surf the Internet?—Every day.A. How longB. How farC. How oftenD. How soon

问题补充：

—do you surf the Internet?

—Every day.

A. How long

B. How far

C. How often

D. How soon

答案：

A. How long

B. How far

(答案→)C. How often

D. How soon

解析：How long多长；How far多远；How often多久一次；How soon多久。根据下文，每天。可知上文提问的是频率，故选Ｃ。