Question tags question

[harry]

English Grammar Tests, Elementary Level

ESL/EFL Test #36 "Question Tags (2)", question 8

Paul: 'I spent thousands on that car.'
Sarah: '.........'

(a) Oh, you have, have you?
(b) Oh you did, did you?
(c) Oh you do, do you?
(d) Oh you do, don't you?

English Grammar Tests, Elementary Level

ESL/EFL Test #36 "Question Tags (2)", answer 8

Paul: 'I spent thousands on that car.'
Sarah: 'Oh you did, did you?'

Correct answer: (b) Oh you did, did you?
_________________________

I think that none of the above is right.
It should be: "Oh you did, didn't you?

[Alan]

Hi,

This is the same as question 5 in this test because the second speaker is expressing surprise. You say:

[Ednalargo]

I want more explanation please!