英语高手进`关于定于从句`
英语好的请教下.
We'll never forget the day ＿＿＿＿ the teacher came to see me in the hospital.
这里用when 还是 that
另外解释一下什么时候跟when什么时候跟that.
还有一个，刚忘了，不好意思～
In the room ＿＿＿＿ window is open lives an old woman.
这里用that还是which呢？