Question

I will never forget the day ____ he spent with his students. A .when B.which C.on which D.in which

when与介词加which有什么区别

Answer 1

which是代词在定语从句中作主语，宾语。本句中它作动词spent的宾语。而when是副词在从句中只作时间状语。如定语从句中谓语动词是不及物用when作时间状语。如下句
I will never forget the days when we worked together.所以这句填which. 意思是我永远都不会忘记他和学生们度过的日子。

Answer 2

when 表示时间什么时候