I had no idea that you were planning to come — you __________ me.

[Tae-Bbong-E]

I wonder which choice is correct.


Before asking for the answer, I already googled it but I was not able to find the correct answer.
As well, it would be welcome of you to tell me the reason.

 

[teechar]

[STRIKE]Before asking for the answer,[/STRIKE] I already googled it, but I was not able to find the correct answer.
[STRIKE]As well, it[/STRIKE] Also, I would be [STRIKE]welcome of[/STRIKE] grateful if you [STRIKE]to[/STRIKE] could tell me the reason.

The last two are wrong, because they're about the present or future.
The second fits the pattern of a theoretical past situation. (If he had intended to come, he would have warned me).

The first is the correct choice. We often use "might have" like that for criticism or mild admonishment.