The skating marathon has been going for give hours now.

The skating marathon has been going for give hours now. The skating marathon has been going for five hours now中going 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 the skating marathon,go,for eight hours,now 连词成句 Alison has been skating for five hours. Sam has been skating for four hours.改为否定句 Next is Sam ,and he has been skating for four hours has been on the phone for several hours The meeting has been _____ (结束)for 2 hours. The meeting has been off for two hours.It______since_______.