问题
选择题
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
答案
答案：A
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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
答案：A
