the teacher said " class is over ",the students stood up and walked out.

题目

the teacher said " class is over ",the students stood up and walked out.
at these words
at在这是什么用法
可以换为with吗
the teacher said " class is over ",at these words ,the students stood up and walked out.

答案

at 在这句话中表示“in respond to sth ” 有 "回答,响应"的意思
这句话表示为“老师一说完下课,作为对下课的响应,同学们都站起来并走出去”
不能用 with ,with 没有这个用法.