Fill in the blank with the most suitable verb:
I ________ my homework very quickly last night.
A verb is used to express an occurrence, action, or state. It is the grammatical centre of the predicate in a sentence.
An auxiliary verb is a verb which gives is used in the formation of tenses, moods, tones, etc.
Option C is correct as the subject is I and last night suggests the use of past simple tense (did). Do (did) is used as a main and an ordinary verb here which means 'carried out an action in the past'.
The other options are wrong as the main verb is missing and there is no need to use an auxiliary verb.
The correct answer is C)did