Question

which of the following uses the preterit tense? nicolas estaba muy nervioso. ella estaba sorprendida. el bombero apagó un fuego grande.

Explanation:

The preterite tense in Spanish is used for completed actions in the past. "Apagó" in "El bombero apagó un fuego grande" is in the preterite tense. The other two sentences use the imperfect tense ("estaba").

Answer:

El bombero apagó un fuego grande.