问题补充：
Tsinghua University, in 1911, is home to a great number of outstanding figures.
A. found
B. founding
C. founded
D. to be founded
答案：
A. found
B. founding
(答案→)C. founded
D. to be founded
解析：句意：成立与19的清华大学是很多杰出人物的摇篮。found 成立，在本题中作为非谓语动词，表示被动和完成，故选C
