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Scenario: You haven't come down here for so long pal, what's up?

1. That was because I had been really busy until now.

2. That is because I had been really busy until now. (Is 'is' wrong? Why?)

Thanks.
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Jack112Scenario: You haven't come down here for so long pal, what's up?

1. That was because I had been really busy until now.

2. That is because I had been really busy until now. (Is 'is' wrong? Why?)

Thanks.

I prefer "that is because I have really been...."
Comments  

I found this explanation in the web. I hope it can help.

Until now

until now adv : used in negative statement to describe a situation that has existed up to this point or up to the present time; "So far he hasn't called"; "the sun isn't up yet" [syn: so far}, thus far, up to now, hitherto, heretofore, as yet, yet, til now]

 Philip's reply was promoted to an answer.