The teachers were always trying to the excited students at that time.
A. calm down
B. set down
C. let down
D. turn down
网友回答
(答案→)A. calm down
B. set down
C. let down
D. turn down
解析：考查词组：A. calm down冷静下来，B. set down记下，C. let down让…失望，D. turn down拒绝，句意：在那个时候，老师总是想把兴奋的学生冷静下来。选A。