— do you surf the Internet?—Twice a week.A. How farB. How soonC. How oftenD. How long

问题补充：

— do you surf the Internet?

—Twice a week.

A. How far

B. How soon

C. How often

D. How long

答案：

A. How far

B. How soon

(答案→)C. How often

D. How long

解析：根据答语“Twice a week.”可知问句的特殊疑问句应该为“how often”故选C