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---        do you exercise?

--- I exercise three times a week.

A. How often                  B. How many days

C. How usually                  D. How much

- ____________ do you exercise?

- I exercise three times a week.

A. How often　　

B. How many days　　

C. How usually　　

D. How much

---You look very healthy. ________do you exercise?
-----I exercise three times a week.