It is the museum that we visited last year.是定语从句还是强调句?

问题描述:

It is the museum that we visited last year.是定语从句还是强调句?
老师说是定语从句,我感觉不像啊.

that 是先行词
museum是被修饰词
we visited last year来限定museum
It is the museum where we visited last year.就是强调句了【我觉得这即是定语从句又是强调句】把It is和that去掉,,we visited the museum不行么????句式变了哟这是陈述句