Final answer:
The sentence 'Un camión manejó con exceso de velocidad.' uses the Preterit Tense to describe a completed action in the past.
Step-by-step explanation:
The sentence that uses the Preterit Tense is: Un camión manejó con exceso de velocidad.
The Preterit Tense, or pretérito in Spanish, is used to talk about completed actions in the past. In this sentence, the verb 'manejó' (drove) is conjugated in the Preterit Tense, indicating a specific action that happened in the past.
On the other hand, the other two sentences do not use the Preterit Tense. The sentence 'Una explosión no' lacks a verb, and 'El tiempo estaba lloviendo mucho' uses the Imperfect Tense ('estaba lloviendo') to describe an ongoing action in the past.
Learn more about Preterit Tense in Spanish