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marie340x
wouldn't the subject be the best friend? because thats the topic of the sentence. 

According to the given sentence,  My best friend left, here left is considered as the object.

What is an object in a sentence?

An object is a noun (or pronoun) that is governed by a verb or a preposition.

An object is the person, place, or thing that receives the action. Direct objects are the results of action. A subject does something, and the product is the object itself.

Learn more about object, refer to the link:

https://brainly.com/question/24320025

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