分析下services growth is estimated to have been 19.1%.

题目

分析下services growth is estimated to have been 19.1%.
services growth is estimated to have been 19.1%.其中to have been ..是作状语还是作什么语

答案

主语补足语,也就是“主补”了
还原成主动语态：
we estimate services growth to have been 19.1%.
to have been 19.1%做宾语补足语,因此原句里面就是主语补足语了