had been shelling
Past perfect progressiveconjugation ofshell.There are other translations for this conjugation.

shell

The breakthrough from Horlivka towards Donetsk began in the evening of July, 28; at that the terrorists had been shelling residential areas of the city since morning.
Avance a Donets'k desde Horlivka comenzó por la noche el 28 de julio, mientras los terroristas desde la mañana hicieron el bombardeo de los barrios residenciales de la ciudad.
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