is a good of exercise for both the young and the old.A. the walk B. walkingC. To walkD. wa

发布时间：2020-08-16 16:07:12

     is a good of exercise for both the young and the old.
A. the walk
B. walking
C. To walk
D. walk.

网友回答

A. the walk
(答案→)B. walking
C. To walk
D. walk.
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