Yao Ming is well-known a player. He is good playing basketball. Aby; forB．by; atC．as; a

问题补充：

Yao Ming is well-known a player. He is good playing basketball.

A．by; for

B．by; at

C．as; at

D．as; for

答案：

解析：be well-known as表示以什么样的职业而出名，be good at表示擅长的意思，故本题选C。