there is not one of us（）wishes to help you.A.who B.that为什么不选

that也可以指物

也可指人

这边的第二种 定语从句中只用WHO,不用that的情况 1. 先行词是one, ones或anyone时;先行词为those 或被those修饰，指人时 One who does not work hard will never succeed. Anyone who breaks the law should be punished. She is the only one of the students who has been to the USA. Those who learn not only from books but also through practice will succeed. 2. 在以there be…的句子中，先行词为人时 There is a comrade outside who wants to see you. 3. 当定语从句中又有定语从句,且先行项都为人时 The student that won the first prize is the monitor who works hard. 4. 当指人的先行项被一些指物的名词修饰时 There 's only one student in the school who I want to see. Do you know the woman in blue with a baby on her back who is working in the fields? 5. 在非限制性定语从句中指人 I met a friend of mine in the street, who had just come from America. 6. 定语从句中有插入语时, 且先行项为人时 Jackson is a man who I believe is honest.

你的回答完美的解决了我的问题，谢谢！