To keep healthy,Professor Johnson cycling as a regular form of exercise after he retired.

发布时间：2020-08-17 13:25:34

To keep healthy,Professor Johnson      cycling as a regular form of exercise after he retired.
A. caught on
B. set out
C. made for
D. took up

网友回答

A. caught on
B. set out
C. made for
(答案→)D. took up
解析：take up意思是“占据，占领，从事”。
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