1The teacher made a speech [that] sh thanked for the class for the gift. 【that 为啥不能用which替换】
2 I will never forgot those days [which ] I spent in the countryside.[which能用when代替吗】
3there are some books here,but which one [ ]
you?
a is belonging to b is belonged to c belongs to d belongs
[请注明原因,逐个解析。谢谢!