Respuesta :
Answer:
b) use to
Explanation:
This is because at the beginning of the sentence there is already a past tense "did" so the verb after that would have to be in base form which would be "use to". It's a rule so I can't really explain much.
Answer:
use to
Explanation:
The auxiliary verb (did) is marked for past tense, but the main verb (use) is not cuz it's supposed to appear in it's base form