请帮解析一句话的语法!

问题描述:

请帮解析一句话的语法!
Ana Petrovich reviewed Underground,which has just been released on DVD.
请问为什么要这样的动词has just been released

has just been released 因为是强调“刚”发布,说明是才完成的.
sorry,he left.抱歉,他走了.
i'm sorry,he has just left.很抱歉,他刚离开.