1.Which one must she be?2.She must not be reading.3.I do not think the woman can be the youngest of us.欢迎追问第一个为什么那样答她一定是第几个？翻译过来是这样。然后用你打的句子回答。她一定是第五个。这样很合理啊，no problem啊。欢迎追问