问题
选择题
---You look very healthy. ________do you exercise?
-----I exercise three times a week.
A．How often
B．How many
C．How much
D．How soon
答案
答案：A
题目分析：How often多久一次；How many多少个；How much多少，提问不可数名词；How soon多久。感觉下文，我每周联系三次。可知上文问的是，你看起来很健康，你多久锻炼一次？故选A。