问题补充：
Liu Dehua is one of teachers in our school.
A. famousest
B. the famousest
C. the most famous
D. most famous
答案：
A. famousest
B. the famousest
(答案→)C. the most famous
D. most famous
解析：本题可以根据in our school，可知所选的是最高级，而famous的最高级为 most famous，同时famous为形容词，其最高级前必须加the，故选答案为C
