—You look so athletic.do you exercise?—Twice a week.A. How muchB. How longC. How far D. Ho

问题补充：

—You look so athletic.do you exercise?

—Twice a week.

A. How much

B. How long

C. How far

D. How often

答案：

A. How much

B. How long

C. How far

(答案→)D. How often

解析：回答语是频率，对频率提问的用how often，故选D。A对价格提问，B对长度提问，C对路程提问，故只能选D。