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Which of the following sentences is NOT grammatically correct in the preterite tense?
María construyó una torre.
María construyo una torre.
María y tú construisteis una torre.
María y yo construimos una torre.

Answer :

Answer: C

Explanation:

C is not grammatically correct because construisteis isn't in the right tense(past tense, present, and something else)

María construyo una torre & María y tú construisteis una torre.