直到所有学生都离开英语怎么说

A. 直到所有学生都停止说话，老师才开始上课。用英语怎么翻译

The teacher didn't start his lessons until all the students had stopped talking.

B. 大一、大二、大三、高一、高二、高三用英语分别怎么说

美国高中和大学都四年。一年级 Freshman二年级 Sophomore三年级 Junior四年级 Senior

C. "直到所有的学生都安静下来,老师才开始上课"用英语怎么说

The teacher ____started_______________ the lesson _______when____all the students became quiet .

D. 那个小孩故意躲在门后面直到所有人离开英语翻译

deliberately on purpose