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To keep healthy,Professor Johnson        cycling as a regular form of exercise after he retired.

A.caught on                  B.set out                       C.made for                   D.took up

To keep healthy,Professor Johnson _______ cycling as a regular form of exercise after he retired.

A. caught on B. set out

C. made for D. took up?

To keep healthy, Professor Johnson ________ cycling as a regular form of exercise after he retired.

To keep healthy, Professor Johnson ________ cycling as a regular form of exercise after he retired.

A．carried out        B．caught on         C．took up           D．made for

To keep healthy, Professor Johnson _________ cycling as a regular form of exercise

after he retired.