i gave up what might have been a maginificent career as a painter 其中have been是啥意思?

题目

i gave up what might have been a maginificent career as a painter 其中have been是啥意思?
我搞不懂have been有几种什么样的用法

答案

用法：固定搭配 might have been
意思：有可能是