There is a very beautiful garden on campus, that is my favorite spot.
【正确答案】：There is a very beautiful garden on campus, which is my favorite spot.
【题目解析】：that前面有逗号，说明后面的是非限制性定语从句。非限制性定语从句的引导词不能用that，由于先行词是beautiful garden，所以引导词要用which。句意：校园里有一个非常漂亮的花园，这是我最喜欢的地方。