Fill in the blank with the most appropriate word.
________ you like learning English?
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 you and the main verb like is in its first form and the question talks of a hobby (learning English). Do is used as an auxiliary verb here.
The other options are wrong as the question is not in the present continuous or past perfect tense. The given main verb is neither used in its third form nor as a gerund.
The correct answer is C)do