Question

Complete the sentence with the verbs in brackets. Use the past perfect simple or the past continuous
1.

Answer 1

Respuesta:

1. The volunteers knew what to do in an emergency because they had received plenty of training.

2. Our teacher had been showing us a DVD about the atmosphere when the fire alarm started ringing.

3. The explorer had been lost for three days before he was rescued.

4. I had been preparing for the presentation when my computer crashed.

Explicación:

1 y 3 son eventos distintos que sólo ocurrieron una vez

2 y 4 fueron interrumpidos ("when" es una indicación de eso)