According to the context, the most appropriate Spanish preposition to complete the sentence is "para".
What are prepositions?
In Spanish, they are words that function as invariable parts of sentences that are responsible for denoting the link between the terms.
In the sentence "Salgo para San Diego mañana", "para" is the correct option since it serves as a link and it indicates direction in this case.
Therefore, we can conclude that according to the context, the most appropriate Spanish preposition to complete the sentence is "para".
Learn more about prepositions here: https://brainly.com/question/22177728
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