was fine-tuning
Past progressiveconjugation offine-tune.There are other translations for this conjugation.

fine-tune

In these operations, North was fine-tuning the secret supply network that the CIA had set up between 1981 and 1984.
En esas operaciones, North perfeccionó la red secreta de abastecimiento que la CIA estableció entre 1981 y 1984.
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