Answer:
The correct option to choose is:
- Los trenes de Costa Rica corrían cuando de repente b) hubo un terremoto.
Explanation:
- The key thing to have in mind is the correct tense in the sentence. In this case the correct tense is past tense.
- With that in mind the following thing is to conjugate correct the adjective. In the sentence the adjective is hay (there is).
- Hay in past tense is hubo.
With all those three steps now you can choose the answer. In this case is letter b) hubo un terremoto
