问题补充:
--- does your cousin exercise? ---Three times a week.
A. How many
B. How often
C. How long
D. How much
答案:
A. How many
(答案→)B. How often
C. How long
D. How much
解析:句意:--你表弟多长时间锻炼一次?--一周三次。A. How many多少次; B. How often多久一次; C. How long 多长; D. How much多少。根据句意故选B。