has been duping
Present perfect progressive he/she conjugation of dupe.

dupe

It is the height of thoughtlessness and naiveté to take over mechanically and uncritically and to repeat what has risen among others in decades of struggle against the nationalist bourgeoisie which has been duping the people.
Es el colmo de la irreflexión y de la inocencia adoptar y repetir mecánicamente y sin crítica lo que ha cristalizado en otros durante decenios de lucha contra la burguesía nacionalista, que engaña al pueblo.
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