Having been done ,done,having done

题目

Having been done ,done,having done
____many times,he still couldn't understand it.
A、Having been told B、Told
为什么答案是A，现在分词完成时的被动，B也可以表示完成和被动啊。
同样，还有一道题：The building____last year is a restaurant.
A、having been built B、built
这道题为什么选B呢？

答案

Having been done 是现在分词的完成时的被动语态,用的时候常常会出现一个段时间状语.如：
Having been built for two years,the building will be used as a hospital
,done是过去分词,表示被动和完成,如
completed last month,the building will be used as a hospital
having done 是现在分词的完成时的主动形式,用的时候常常会出现一个段时间状语.如
Having worked for a long time ,the workers are all very tired.