do you exercise in a week?A. How long B. How far C. How often

问题补充：

do you exercise in a week?

A. How long B. How far C. How often

答案：

解析：句意：你一周锻炼多久？How long多久，对一段时间提问；How far多远，对距离提问；How often多久一次，对动作发生的频率提问。所以选A。