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

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问题 —Do you know that Jack ______ a postman for about six years? —Yes, I see.

选项 A、has become
B、has turned
C、has changed
D、has been

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。
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