On the second floor of the house are three rooms,___serves as my daughter's study.the largest of which 为什么不能用the largest of those?求分析,

at the second floor 还是on the second floor It's on the second floor. 对on the second floor 提问 on the second floor用什么提问 A cinema is on the second floor Were you on the second floor? he lives on the second floor.就second划线提问、 the seadfood section is on the second floor.对on the second floor进行提问 she lives on the second floor.画住on the second floor 画线提问 怎么写 in the second floor 与 on the second floor有什么区别? on the second floor 与 at the second floor 有什么区别? 请问on the second floor 与 at the second floor 有什么区别? second,gym,the,is,the,floor,on连成句子 floor is the on restaurant the second 连词成句 is,on,reading room,the,the,floor,second.连成一句话 Art room,the,floor,second,on,is,The排列句子 floor,is,the,on,restaurant,the,second,(.)(连词成句) is on second it floor the 改疑问句和陈述句