13. A: ________ does the average person walk each day? B: About 7,500 steps per day.
(A)How often
(B) How soon
(C) How old
(D) How far

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統計: A(35), B(3), C(0), D(147), E(0) #1537710

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#3878287
How long?問長短,可以是距離,可...
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