Respuesta :
We can actually deduce here that the correct sentence will become: I first met my best friend three years ago.
What is correct sentence?
A correct sentence is actually known as the sentence that is correctly written and which have all the grammatical functions correct.
We can see here that "meet" is the word that should be changed into "met". This is because the sentence itself is in the past so the verb should be in past tense.
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