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When did you leave the bus station?( ) I saw him get on the

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When did you leave the bus station?( ) I saw him get on the bus and sit down.
A Before B After C Since D Until
选B 为什么不选D until 意思也通啊
当until 后边不是表示否定意思的句子时,它表示的是动作一直延续,而get on the bus, sit down都是短暂性动词,一瞬间就能完成. 所以用after,表示他上车,坐到座位之后我才离开