问题
单项选择题
—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
参考答案：D
解析：
A、B、C三项都是终止性动词，不能和后面的for about six years连用。
搜题请搜索小程序“爱下问搜题”