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.
Prepositions ususally stand before nouns, in this case "on" is the preposition.
I dont get what you are saying..
Answer:
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Explanation:
