题目：（）by an American university,i finally flew to San Francisco on August 6,1988.

Being invited B.Having been invited D,1988：（）by an American university,i finally flew to San Francisco on August 6题目.Hanving invited C.
A

C

Having been invited =After I was invited

C.Having been invited

D

c

你好！ C 这里肯定是被动的，排除AB C作伴随状语 仅代表个人观点，不喜勿喷，谢谢。