There happened to be no one in the building _____the fire broke out.填写复合句连词我个人认为when 和 where 都可以啊 应该怎么填写

There ( )nobody in the room.were just happened being were happened happened to be. It happened to be 和There happened to be有什么区别? there happened to be 还是there happen to be把happen换成appear呢? There happened to be no one in your office when I phoneThere happened to be怎么回事啊` 去掉怎么样 There happened to be nobody in the room 句中的主语是:nobody吗? There happened to be nobody in the hall 属于哪种基本句式 one day,there happened to be an a___on the main street 高中英语反义疑问句There happened to be nobody under the wall whenit fell downThere happened to be nobody under the wall whenit fell down,_________?填did there还是didn't there?请说明一下理由, It (so) happened that.什么时候加so?It (so) happened that.这个句型什么时候加so,什么时候不加so?另外：There happened to be nobody in the house on fire.中为什么开头用There 而不是It? there happened to be英语语法专家进___happened to be no one in the deserted building when the fire broke out last night.A.It B.This C.There D.ThatIt happened to be 和There happened to be有什么区别? There---to be only two eggs left in the refrigerator.A happens B happen C is happened D had happened求答案 还有分析下 When we harried to the station,there happened to be no bus at that time.中的to be 为什么不能用to have the old man happened to be on when we hurried to the station,there happened __no bus at that timeto haveto be having being 高中语法小练习( ) happened to be a severe drought that year.A.It B.This C.There D.Then happen 有被动语态吗?顺便有一小题!she happened to be there at this time yesterday morning.改为同义句! Peter was happened to be at home that day.为什么是was happened而不是happened She couldn't leave earlier,because there happened ----a English testA.to be B.to have C.to take D.to hold要理由