She's the only one who's studying Frence?为什么用who,而不用that?

She's the only one who's studying Frence?为什么用who,而不用that? she's the only one who's studying french.who's he is the only one she is the only one who's studying french 分析下这个句子She's the only one who's studying French. she's the only one who's studying French.________?反义疑问句 who says you're the only one that's hurting It_JACK that parked the car liake that he s the only one who she is the only one who is studying French 模仿造句 she's one of the girls who bought the ticket. she said " who's that the man " 变定语从句 who says that adults are the only ones who know what's going -who's that over there?-It's Lucy's sister.这里回答为什么要用It's She