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

发布时间：2020-08-16 12:07:08


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

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(答案→)A. took up
B. caught on
C. carried out
D. made for
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