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.
use to
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
Answer: I'm sure its B
i put C
it was correct
B
