Which adverb (already, yet, or just) does complete the sentence?

The answer to the question above is already. “Have you already finished your homework?”
Already is an adverb that is used to show what time or when something was done. Already is an adverb of time. An adverb is a word that modifies a verb, adjectives, and other adverbs.

For the question above, “yet” is not correct as the word yet does not fill in the gap correctly. Yet is an adverb of time that is used to refer to the time that starts in the past and continues up to the present. Yet it can also be used for negative sentences.

Just is also incorrect because the word does not fit into the question above. Just adverb is also an adverb of time that is used to indicate that something happened a short while or time ago.