On April 24, Tsinghua University its 100th anniversary at the Great Hall of the People in Beijing.
A. congratulated
B. challenged
C. celebrated
D. participated
网友回答
A. congratulated
B. challenged
(答案→)C. celebrated
D. participated
解析：四个选项分别表示向某人祝贺、挑战、庆祝（大型活动）和参加（某事），根据题意选C，四月二十四日，清华大学在北京人民大会堂庆祝了它的100周年纪念日。