Night has fallen,we have to stay here for the night,__为什么选don't we而不是mustn't we?

Night has fallen,we have to stay here for the night,__为什么选don't we而不是mustn't we? THE SKY HAS FALLEN怎么样 It was a long journey,darkness______as we near the mountain villoage.为什么选was falling而不选has fallen The old man needs at most five hours' sleep a night,but he ______ for over seven hours tonight.A.has fallen asleep B.has slept C.has gone to bed D.has gone to sleep She has fallen ill for a week he has fallen asleep.这是什么结构. He has fallen asleep.这是系表结构吗? fallen Fallen fallen fallen Fallen Maybe we shouldn't have fallen into as the night time as fallen中的as we switched on the radio and learned that more than ten inches of snow hand fallen during.the night and sina the rads were blocked ,there would be no school that day. She has fallen ill since two days ago.(改错) Has fallen apart right in front of you翻译中文 if the god of love has not fallen 急