This is the best hotel in the city____I know.这个定语从句为什么不能填which呢?只能填that么?

This is the best hotel in the city____I know.这个定语从句为什么不能填which呢?只能填that么?
This is the best hotel in the city____I know.这个定语从句为什么不能填which呢?只能填that么?

This is the best hotel in the city____I know.这个定语从句为什么不能填which呢?只能填that么?
定语从句,主句先行词前被最高级、序数词或all修饰的时候,引导词只能用that,不能用which.
如：This is all that I know

因为best 最好的，是最高级，只能用that