How is the bolded word being used?

until i had seen the show myself, i couldn’t understand the jokes.

preposition
adverb
subordinating conjunction

i believe it would be as a preposition because it is not an adverb.

in this passage from "animal farm", by george orwell, the statement that best explains how boxer's response supports the author's purpose in writing an allegory is option b) orwell uses boxer's decision to avoid more carnage by working hard to show how the working class was manipulated. boxer and the other animals feel they are responsible for their carnage because napoleon uses propaganda to manipulate the animals of the farm.

explanation:

can’t really write an essay but think about ur goal and think “how would i do this” sorry if it didn’t