摘要：31．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 up
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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
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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
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B．caught on
C．carried out
D．made for