I bought the nirvana unplugged, and I saw the tablature say this,
E-------3----- B-------0----- G-------0---- D-------0--- A ----------- E ------3---
How would I play this?
That tablature doesn't say anything about skipping strings.
An "O" on a strong means you play that open string without fretting it.
From what you have written it looks like you aren't playing the A string. If that's the case just mute it with the finger playing the 3rd fret on the low E.
To do this, just let it rest on the A string - many people do this by accident when learning, anyway.
This is a simple open G chord, with the B note usually on the A string not played. One way is to touch the A string with the pad of the finger you press the bottom string down with,(most likely middle), so it's muted. It is a technique used a lot by guitarists, particularly when playing jazz chords, where a string in the middle, for instance, isn't needed. Another way is to pluck all 5 notes with thumb and 4 fingers - it's an acquired art, but worth working on, and particularly tricky when trying to hold a pick! Pick between index and thumb gives you 3 spare fingers, and who'd notice a missing string in the middle of the chord?