relative clause

I dare say your teacher is absolutely wrong if he has made that statement.

"which" is a relative pronoun. But in sentence B, "which" refers to nothing and so which cannot be put in that place.

Look at the sentence below:
We are standing on the 70th floor of the building from which we have a panoramic view of the harbour. (correct, which refers to 70th floor of the building)

You could see the runners very well from where we stood.
= You could see the runners very well from the place that we stood.

Only sentence A is correct.

Bis wrong.Because you are talking about the place,not a thing.

Hope can help you well!!!

A: you could see the runners very well from where we stood.
B: you could see the runners very well from which we stood.

A is correct~~~
B is wrong~~~

成句的意思是
你可以從我們站的地方清楚的看到跑手們。
地方/位置 我地當然會用where

which 用於死物
例：This is the bag which I brought yesterday.
姐係話
這個袋是我昨天買的。