Webster his American Dictionary of the English Language, which first appeared in 1828.
A. is best known for
B. is most known for
C. is best known as
D. is most known as
网友回答
(答案→)A. is best known for
B. is most known for
C. is best known as
D. is most known as
解析：考查词组和形容词比较级：句意：Webster最以《美国英语词典》著名，它一开始是在1828年开始的。Be well known for因为…而著名，be well known as做为…而著名，所以排除CD，还有well known的最高级是best known，选A。