This passage is from my textbook:
We use have you? / isn't she? / do they? etc. to show interest in what somebody has said or to show surprise.
1): 'It rained every day during our holiday.' 'Did it? What a pity!'
2) 'Jim and Nora are getting married.' 'Are they? Really?'
As you see in those short statements of surprise the verb goes before the subject (Did it? Are they?) But in my real life experience I think I have always heard the subject before the verb (It did? They are?)
I can remember two situations:
'People are carnivores.' 'They are?' (conversation)
'George doesn't work, he is a bum. That's why he lives with us.' 'He does?' (Seinfeld show)