had been advancing
-había estado avanzando
Past perfect progressiveconjugation ofadvance.There are other translations for this conjugation.

advance

Suddenly the work that had been advancing so prosperously was checked.
De repente, la obra que había estado avanzando tan prósperamente fue interrumpida.
It made clear to whom Rogovin fundamentally owed the views he had been advancing over the course of the previous decade.
Dejó en claro a quién Rogovin debía fundamentalmente los puntos de vista que había estado avanzando a lo largo de la década anterior.
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