The first would refer to a repeated action. The second could refer to a repeated action or a single instance.
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AnonymousThe first sentence should be "used to" because it is in the past tense.I missed that
AnonymousThe first sentence should be "used to" because it is in the past tense.Logically it's "Did you use to ...". It's the auxiliary that shows the tense.
AnonymousThe first sentence should be "used to" because it is in the past tense.On the contrary, the verbal inflection is carried by "did".