“Do you know that Jack a postman for about six years?” “Yes I see.”A. has becomeB. has

问题补充：

“Do you know that Jack a postman for about six years?” “Yes, I see.”

A. has become

B. has turned

C. has changed

D. has been

答案：

A. has become

B. has turned

C. has changed

(答案→)D. has been

解析：因为A、B、C均为终止性动词，均不能连用 for about six years 这样的一段时间。