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
网友回答
A. set up
B. sets down
(答案→)C. sets aside
D. set out
解析：考查词组：A. set up建设，B. sets down记下，C. sets aside放置一边，留出，腾出，D. set out开始，句意：为了保持健康，他每天留出一小时锻炼。选C。