estaban refrigerando
Imperfecto progresivo para el sujeto ellos/ellas/ustedes del verbo refrigerar.

refrigerar

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500+ learners.
Solo dos de los tres serpentines del bucle se estaban refrigerando.
Only two of the three coils in the loop were being cooled.
Solo dos de las tres bobinas en el circuito se estaban refrigerando.
Only two of the three coils in the loop were being cooled.
Palabra del día
el invernadero