Final answer:
The given sentence is incorrect as written. The verb should be in the singular form to match the singular subject.
Step-by-step explanation:
The sentence "El día de Navidad mi mamá me regalaron un carro" is incorrect as written. The subject of the sentence, "mi mamá" (my mom), is singular, so the verb should be in the singular form as well. The correct sentence should be "El día de Navidad mi mamá me regaló un carro" where "regaló" is the singular form of the verb "regalaron".
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