28. A: __________________________
B: I exercise three times a week to stay fit.
(A) How long is your vacation?
(B) How much is the T-shirt?
(C) How often do you exercise?
(D) How many kids do you have?
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統計: A(44), B(15), C(287), D(26), E(0) #3384257
統計: A(44), B(15), C(287), D(26), E(0) #3384257