have been amassing
-he estado acumulando
Present perfect progressive conjugation of amass. There are other translations for this conjugation.

amass

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Certain parties have been amassing huge profits over all these years at the taxpayer's expense, because they had a monopoly; their prices had to be paid, and they built up enormous reserves with their tax-free billions.
Unos han tenido durante todos los años unos beneficios enormes a costas de los contribuyentes, pues tenían un monopolio y había que pagar los precios marcados, y con sumas millonarias libres de impuestos han creado unas elevadas reservas.
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