Final answer:
The sentence that uses the simple past tense is 'Yo fui a República Dominicana en mis últimas vacaciones.'
Step-by-step explanation:
The sentence that uses the simple past tense is 'Yo fui a República Dominicana en mis últimas vacaciones.' In this sentence, the verb 'fui' is conjugated in the simple past tense. It translates to 'I went' in English.
Learn more about simple past tense in Spanish