Respuesta :
Answer: B. estar
To form the imperfect continuous you use imperfect tense of the verb estar + the present participle of the verb that tells what you were doing.
Example: Los niños estaban jugando fuera y los vecinos estaban hablando en voz baja.
Translation: The children were playing outside and the neighbours were speaking quietly.
Spymore
Answer:
B. estar
Explanation:
you use estar + present participle to form the imperfect continuous form.