. Students should everything important their teachers give in class.
A. set up
B. set out
C. set aside
D. set down
网友回答
A. set up
B. set out
C. set aside
(答案→)D. set down
解析：短语辨析。A. 建立；开业 B. 出发；开始；陈述 C. 留出；撤销；不顾 D. 记下；放下。句意：学生们应该记下老师在课堂上讲的每件重要的事情。故选D。