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
网友回答
(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。