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after / in 的区别用法

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after / in 的区别用法
after / in 的区别用法
in +时间段:与将来时连用
after +时间段:与过去时连用
after +时间点:可与将来时连用
He will be back in two hours.
He came back after two hours.
He will be back after two o'clock.