The preposition in the given sentence is:
Based on the given question, we are meant to show the preposition in the given sentence which talks about the time Jessica left.
With this in mind, we can see that preposition has to do with the position of things or the time of an event and "before" is the preposition in the given sentence.
Therefore, the preposition is before
Read more about preposition here:
https://brainly.com/question/24611488
