题目

had been 和 Having been 区别?
____ by an American university , I finally flew to XX on August 1, 1988
Having been invited / Had been invited
为什么选后面一个?

提问时间：2020-10-18

答案

had been是过去完成时,having been是现在完成进行时.
《过去完成时》是过去某个时间做的事,并且已经做好.
《现在完成进行时》是可能是过去开始的,但是持续到现在才完成或者还在进行.
这句中有具体的时间,是过去已经完成的事,所以选过去完成时.