-Did you work out the problem?yes,I --to the teacher’s为什么have just been,不能 have just come

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-Did you work out the problem?yes,I --to the teacher’s为什么have just been,不能 have just come

-Did you work out the problem?yes,I --to the teacher’s为什么have just been,不能 have just come
-Did you work out the problem?yes,I --to the teacher’s为什么have just been,不能 have just come

-Did you work out the problem?yes,I --to the teacher’s为什么have just been,不能 have just come
come 是个短暂性动作,在这里只是说我“到达”这一动作,而been可用作一个持续或长时间一点的的动作.一般现在完成时是用持续完成状态的.
意思大概就这样,好久不学英语词态了,有点不知道怎么表达了.

come不是过去式