hubieron cooperado
-they/you had cooperated
Preterite perfectellos/ellas/ustedesconjugation ofcooperar.

cooperar

También he recibido cartas, de una buena cantidad de humanos buenos, quienes sostienen que los Zetas vienen con gran honestidad, que hubieron cooperado con ellos en una buena forma.
I have also received letters, from quite good earth humans, who had the Zetas come in greater honesty, would have cooperated with them in a good way.
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lean