In order to keep healthy he an hour every day to take exercise.A. set up B. sets downC.

问题补充：

In order to keep healthy, he an hour every day to take exercise.

A. set up

B. sets down

C. sets aside

D. set out

答案：

A. set up

B. sets down

(答案→)C. sets aside

D. set out

解析：动词短语辨析。A建立，设立；B写下；定居；C，储蓄，拿出；放在一边，不管不顾；D出发，动身；根据句意可知C正确。句意：为了保持健康，他每天抽出一小时来锻炼身体。