Ejercicio 1: Completar las Oraciones sobre Pasado

Ejercicio 1 Complete las oraciones A I washed the floor when the plane had finished painting B I washed the floor when the plane was painting The sentence that expresses an event in the past that happened before another event is O None of the sentences express a past O Sentence A because it uses past continuous O Sentence B because it uses past simple O Sentence A because it uses present perfect O Sentence B because it uses past perfect