看到一句It is 3 years since he joined the army.和一句It has been three hours since he left his office.is和has been可以互换?
看到一句It is 3 years since he joined the army.和一句It has been three hours since he left his office.is和has been可以互换?
英语人气：618 ℃时间：2019-10-01 17:31:33
优质解答
不可以为什么那这两句有什么区别啊时态都是现在完成时阿。。。哦懂了
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