问题
选择题
– ________ do you exercise?
– I used to exercise every day, but now I exercise twice a week.
A. How often B. How soon C. How long
答案
答案：A
题目分析：A. How often多久一次，B. How soon多久以后，C. How long多长时间，used to过去常常做，现在不做了。句意：你多久锻炼一次？我过去每天都锻炼，但是现在我一周锻炼两次。故选A。