北师大版高中英语模块6 Unit16 Lesson3: I remember the morning that I first asked the meaning of the word "love".

北师大高中英语模块6 Unit16 Communication Workshop: The day everything went wrong was May 24.

上句中that引导的是什么从句？

解释：

上句中that引导的是定语从句，此句中that相当于关系副词when。

用作时间状语的关系副词when 通常不能省略，但有一种特殊情况，即用于day, year, time等少数几个词后时可以省略(也可换成that)。

That was the year (that) I first went abroad.就是那一年我第一次出国了。

I'll never forget the day (that) we met.我永远也忘不了我们见面的那一天。