have been gassing
Present perfect progressiveconjugation ofgas.There are other translations for this conjugation.

gas

The police have been gassing and beating demonstrators mercilessly since the beginning, but never was the nature of the state Ergodan leads as obvious as on the night of June 15.
La policía ha estado tirando gases y golpeando a los manifestantes sin piedad desde el comienzo, pero nunca antes ha sido tan obvia la naturaleza del estado que dirige Erdogan como en la noche del 15 de junio.
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