What do the students need to do when a teacher comes into the classroom

问题描述:

What do the students need to do when a teacher comes into the classroom

当老师走进教室学生应该做什么

当老师走进班上时,学生们必须做什么

What do the students need to do when a teacher comes into the classroom
当一名老师进入教室的时候,学生们需要做什么?
when引导的时间状语从句.