翻译：I have just come.
I had just come为什么不对呢？
I just came.錯在哪?可以幫我分析一下嗎?
why "I just have come" is wrong?
i don't know.i am wrong either. maybe it's a common use?
The translation is wrong.
I have just come 我刚到/我刚来
来过了 means "have been (there)", (and probably have already left.)