Schools in China are required to at least one “Sports Day” per academic year.A. set aside

问题补充：

Schools in China are required to at least one “Sports Day” per academic year.

A. set aside

B. set down

C. set out

D. set off

答案：

(答案→)A. set aside

B. set down

C. set out

D. set off

解析：句意：在中国的学校每学年要留出至少一天的时间开体育运动会。set aside留出；set down 放下； set out 出发，开始； set off出发，引起。根据句意故选A。