Their hands were dirty because they ... (paint) the roof of the house for three hours.


tomasfeed25: Правильный ответ-Had been painting.Т.к согласование времен .Они сначала строили,а потом их руки стали грязными->паст перфект,в предложении есть указание на continious ->past perfect continious

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Ответ дал: HellishHelen
1

Their hands were dirty because they HAD BEEN PAINTING the roof of the house for three hours.

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