have been grumbling
Present perfect progressiveconjugation ofgrumble.There are other translations for this conjugation.

grumble

The Europeans have been grumbling about Russia's actions in the Ukraine, ignoring the role of western interference in provoking the mess there in the first place.
Los europeos se han quejado por las acciones de Rusia en Ucrania, ignorando el papel de la interferencia occidental inicial en provocar el desorden que hay.
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