lucy is the only one _____ comes from the USA.A which B who为什么选B

lucy is the only one _____ comes from the USA.A which B who为什么选B He is the only one The only one is my The truth is only one 是什么意思 [ ]is the cat?-----It's only one. the only one for me is 一道用英语表达的数学题.Tom,Peter,Lucy and Lily are brother and sister.I don't know how old each of them is.I only know one of them is 16,one of them is 14,one of the boys is 12 and one of the girls is 15,and I also know Peter is older than is only one of 和is the only one of有没有区别? Really want is usually only one ,the murderer is you The boy is my only one,he name is there is only one student in the classroom .对onethere is only one student in the classroom .对one提问 10.This is the only one of the books published only one is perfect There is only one bag in the room.对划线部分only one提问 There is only one T-shirt in the living room对only one提问 there is only one picture on the wall 对only one 提问 there is only one sheep on the farm.对only one提问 There is only one glass on the table.对only one提问