had been eroding
-había estado erosionando
Past perfect progressiveconjugation oferode.There are other translations for this conjugation.

erode

Public support had been eroding for the project and it became a major neighborhood controversy for years, but nonetheless, the Arborway Committee sued to try to keep the project alive.
El apoyo del público había estado bajando y se hizo un asunto comunitario controvertido durante años. Pero, sin embargo, el Arborway Committee demandó por mantener vivo el proyecto.
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