had been 和 Having been 区别?

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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?

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.

had been 和 Having been 区别? having been done和had been done的区别 had been done & having been done 区别 have has had或 having +been 的区别和用法请问 had been separated 和having been separated的区别呢? to having been doing 和having been doing 的区别 have been 和had been 什么区别关于having been done 和 have been done的区别 having been done和have been done的区别 HAVING BEEN DONE和HAVE BEEN DONE有什么区别? having been done和done的区别 having been done和having done的区别