问题
选择题
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
答案
答案：D
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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
答案：D
