– ________ 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
A

試題分析：A. How often多久一次，B. How soon多久以后，C. How long多長時間，used to過去常常做，現(xiàn)在不做了。句意：你多久鍛煉一次？我過去每天都鍛煉，但是現(xiàn)在我一周鍛煉兩次。故選A。
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