It has been three hours since he left his office.把has been 换成is也可以吗
It has been three hours since he left his office.把has been 换成is也可以吗
其他人气：499 ℃时间：2019-09-27 05:38:16
优质解答
最好最正确还是用 has been,因为 since 通常都是跟 has been,have been,had been 搭配.
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