A:Sure, but I have to visit my grandpa.
B:Not at all. I’ll be glad to.
C:I really can’t agree with you; I prefer science.
D:I’m sorry, but I have to help my sister with her English.
指出下列材料中的错误,并给出理由。
在巴黎和会上,战胜国与德国签订了《九国公约》,规定德国承担发动战争的责任。 错误:理由: