—Li Ping, your cousin speaks fluent English, like a native speaker.—No wonder. He once in

—Li Ping, your cousin speaks fluent English, like a native speaker.
—No wonder. He once in New York for two years as a visiting professor.
A. had worked
B. has worked
C. worked
D. has been working

A. had workedB. has worked(答案→)C. workedD. has been working解析：可联系答.案.网客服索取。

这个解释是对的