it is that 可否强调谓语？

不可以强调谓语。do可以。
例如：I do think you are right.
He did finish the work before noon.

It is ... that / who... 除了谓语，可以对任何成分强调。
I met Tom in the street yesterday.
1. It was I who / that met in the street yesterday.(强调主语）
2. It was Tom that I met in the street yesterday.（强调宾语）
3. It was in the street that I met Tom yesterday.（ 强调状语）
4. It was yesterday that I met Tom in the street. （强调时间状语）
5. I did meet Tom in the street yesterday.（ 强调谓语）

不行强调句型能强调除了谓语以外的所有句子成分