“ do you exercise?” Three times a week.”A. How longB. How oftenC. How farD. How many

问题补充：

“ do you exercise?” Three times a week.”

A. How long

B. How often

C. How far

D. How many

答案：

A. How long

B. How often

C. How far

D. How many

解析：How long“多长时间”， How far“多远”，How many“多少”，How often询问频率，表示“多久一次”。 根据下文，一周三次。可知上文提问的是多久一次（频率），故选B，你多久锻炼一次？