29.-------- in 1636,Harvard is one of the most famous univer

29.________ in 1636,Harvard is one of the most famous universities in the United States.
A.Being founded B.Having been founded
C.Founded D.Founding
为什么不能选b 不是从句动作明显先于主句完成就用完成被动式吗?要考虑in 1636这样的时间点吗?