To keep fit, Professor Li _____ cycling as a regular form of exercise.

A. took up
B. caught on
C. carried out
D. made up
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科目：高中英語 來源：0119 期中題 題型：單選題

To keep fit, Professor Li _____ cycling as a regular form of exercise.
[     ]
A. took up
B. caught on
C. carried out
D. made up

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