We all like the teachers _____class is interesting and creative.定语从句

We all like the teachers _____class is interesting and creative.
应该填whose 还是 whom 还是when 还是 who
这里应该填whose.如果这个句子分成两个句子就好理
We all like the teachers .The teacher's class is interesting and creative.(The teacher's是可以代替The teacher's,但是它不是连接代词不能连接两个句子,你说是吗?所以在定语从句中用作【定语】的关系代词只有whose了)
The oldest tree which/that I have ever seen is called "strong person"
同样我们也可以把这个句子分成两个句子：
The oldest tree is called "strong person".I have ever seen the tree.
在这个句中the tree=the tree.但是the tree只是个名词不是连接代词,the tree做see的宾语,所以我们选做宾语的指代物的关系代词which/that,你说是吗?
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