This is the only boy___read the book.A.who B.that选哪个定语从句有个规则,先行词被only修饰时,用that.可是类似的句子好多都出现了who怎么理解?这里到底选哪个?

the boy is only ()today The boy is only (三个月大）. Hearts only,This is the only He is the only boy & He is only the boy 这两句有什么区别吗 The boy is my only one,he name is he is the only velic in this he is the only velic in this he is the only velic in this Only when the naughty boy is away()moments of peace in this house.A there isB there are C is thereD are there 改为同义句:the boy is only ten years oldHe is only a __ __ . what is this a boy 还是what is this the boy错了。是who is a boy 还是who is the boy who is This boy 1.This little boy is very shy,He only plays with his()2.We have a good time at the party,because there are many interesting (a ) This is a story about a mother and her son.The boy was only two years old.一篇文章是↑面这样开头的! this is the only subject____he is interested in This little boy is shy ,he only pleys with his (t 0 10.This is the only one of the books published This commitment is lost in the world,the only constant.