---do you take exercise?-Every day.A. How longB. How farC. How manyD. How often

问题补充：

---do you take exercise? ---Every day.

A. How long

B. How far

C. How many

D. How often

答案：

A. How long

B. How far

C. How many

(答案→)D. How often

解析：句意：你多长时间锻炼一次？---每一天。A.多长；B.多远；C.多少；D.频率（多长时间一次）。选D。

考点: 考查疑问词词义辨析。