问题补充:
in 1636, Harvard is one of the most famous universities in the United States.
A. Being founded
B. It was founded
C. Founded
D. Founding
答案:
A. Being founded
B. It was founded
(答案→)C. Founded
D. Founding
解析:由于 Harvard(哈佛大学)与 found(建立)是被动关系,且因句中有 in 1636,故选 C。注意不能选 B,否则前后两句之间缺少必要的连词。