问题补充:
---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. How often
B. How many
C. How much
D. How soon
解析: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。