问题
选择题
---______ does your cousin exercise? ---Three times a week.
A．How many
B．How often
C．How long
D．How much
答案
答案：B
题目分析：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。