Final answer:
The correct option to fill in the blank is 'had finished' as it matches the past tense structure of the sentence.
Explanation:
They met you at night after you had finished your work.
The correct option to fill in the blank is a) had finished. This is because the sentence is in the past tense, and 'had finished' is the past perfect form of the verb 'to finish' which correctly indicates completion before another past action.
Learn more about verb tenses here:
https://brainly.com/question/42890637
