He used to, didn't he?

[nazanin]

Test No. incompl/elem-37 "Question Tags (3)", question 2

He used to work in the city .........

(a) had he?
(b) does he?
(c) has he?
(d) didn't he?

Test No. incompl/elem-37 "Question Tags (3)", answer 2

He used to work in the city didn't he?

Correct answer: (d) didn't he?

Your answer was: incorrect
He used to work in the city has he?
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why?

[Alan]

He used to is a past positive form and so the question tag has to be past negative: didn't he.
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