Can you log into sentence using a classic account and wrath of the lich king

Yes, if you have just a classic account, you can log into WoW. However you can not use and features from BC and Wrath. This includes making blood elf and dranei races and Death knights. you cannot access northrend or outlands, and you cannot level professions past classic wow standards. You will also not be able to level a character past 60.