having done 和 to have done 意义上有什么区别?

题目

having done 和 to have done 意义上有什么区别?
the first person having used telescopes to study the stars and planets 和 the first person to have used telescopes to study the stars and planets 有什么区别?
语法上都没问题,我想知道意义上有什么区别?
我做了一道改错题：
Among the earliest telescopes were Galilean
telescopes,modeled after the simple instruments
built by Galileo,the first person having used telescopes to study the stars and planets.答案为什么要把having used 改为 to have used?

答案

having done 是用进行态来表示已经发生或者正在发生的事情
to have done 是表示将要去做 目前还没做
这种表示法很常见的