问题补充：
Professor White has written some short stories, but he is known for his plays.
A. better
B. more
C. the best
D. the most
答案：
(答案→)A. better
B. more
C. the best
D. the most
解析：句意：怀特先生已经写了一些短篇小说，但是他的话剧更出名些。be well known for sth因为某事而著名，比较级为be better known for sth，故选A
