been in: 在
He's been in the doldrums ever since she left him.
自从她离开他以来，他一直很消沉。
been to: 去过，到过
I've never been to the States.
我从未去过美国。
been at: 在
We found out later that we had been at the same school.
后来我们才弄清楚我们是校友。
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