have been backing
Present perfect progressive conjugation of back. There are other translations for this conjugation.

back

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500+ learners.
The locals have been backing us in this project.
Los de la zona nos han apoyado con este proyecto.
Those union leaders who have been backing Brown must wake up to reality.
Aquellos dirigentes sindicales que han estado apoyando a Brown deben despertar a la realidad.
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