he is the only one in our school that knows Japan.为什么用that ,这是个什么复合句?

He is the only one I only love you no matter who he is!you are the only one in my He is the only one I just a traveler 的意思 The boy is my only one,he name is Because i know that he is the only one that suits you when you reach your peak of performance He's the only one is full for heart .还有I wish you happiness forever.、 h d . is it true that i'm not the only one God knows who is the only one I love The only one is my I am the only one he is the only one of the students who is good at singing He is the only one of the students who is never late. He is the one. He is the only one against my idea.是不是就等于He against my idea. He is the only one of the family who s____ the terrible earthquake 翻译：He is the only one of the students who knows the accident. he is the only one of the students in our school who plys the piano well. he is only one year old是什么意思