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