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。