Question

AS THE MATTER OF FACT 和AS A MATTER OF FACT有什么区别

Answer 1

as a matter of fact意思是“事实是”
the matter of fact意思是“这个事实是”
具体要是放在句子的首位的话，用AS A MATTER OF FACT
THE的后面要加IS 等BE动词。

Answer 2

THE是定冠词，特指MATTER这件事，而A只表示一，一件事！