The skating marathon has been going for five hours now中going

The skating marathon has been going for five hours now中going The skating marathon has been going for give hours now. The,has,skating,marathon,been,for,going,hours,five,now.(连词成句 The skating marathon has been going for five hours now,and s The skating marathon has been going for five hours.改为同义句 The Alison has been skating for five hours. the skating marathon,go,for eight hours,now 连词成句 i've been skating for five hours=i skated for five hours Sam has been skating for four hours.改为否定句 she's been skating for five hours 为什么is been for都不用翻译 They have been skating for five hours 同义句 They have been ska Alison has been skating since five hours ago 对划线部分提问