I was just wondering whether or not you could get promoted in single player so that when you play multiplayer you are the rank you got promoted to in single player?
No ... It is not possible to play single player and get ranked for multiplayer ranked servers. Sorry .
Nope, but ranking sucks anyway. Play mods!
Alternative ranking servers can offer rankings .. look for IDFA gameserver .. we play Allied Intent .2 .. my time on there is around one week playing time and now chasing my butter bar.