问题
选择题
To keep health, Professor Johnson _____ cycling as a regular form of exercise after he retired. [ ]
A. caught on
B. took up
C. carried out
D. made for
答案
答案：B
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To keep health, Professor Johnson _____ cycling as a regular form of exercise after he retired. [ ]
A. caught on
B. took up
C. carried out
D. made for
答案：B