Jack __a postman for about 6 years.a has become b.has returned c.has changed d.has been

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Jack __a postman for about 6 years.a has become b.has returned c.has changed d.has been

D,a become 是短暂性动词不和时间段连用,BC也是而且含义不对

d

A 成为

d

a

D
状态。