It is 3 years since he joined the army 和It has been 3 hours since he left his office.为什么一个用
Itis3yearssincehejoinedthearmy和Ithasbeen3hourssincehelefthisoffice.为什么一个用is一个用hadbeen...
It is 3 years since he joined the army 和It has been 3 hours since he left his office.为什么一个用is 一个用had been
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