had been escalating
-había estado aumentando
Past perfect progressiveconjugation ofescalate.There are other translations for this conjugation.

escalate

Even prior to February 23, the class struggle in Russia had been escalating under the impact of the war and desperate economic conditions.
Aun antes del 23 de febrero, la lucha de clases en Rusia crecía bajo el impacto de la guerra y las desesperadas condiciones económicas.
We finally figured out why the attacks had been escalating, too.
Finalmente descubrimos por qué los ataques habían ido en aumento, también.
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