改错； Today i want to tell you astory about one of my classmates, who are always good at both work
问题描述：
改错； Today i want to tell you astory about one of my classmates, who are always good at both work
答
Today i want to tell you a story about one of my classmates, who is always good at both work.
are 改为is,因为who指代的是one（其中一个同学）,用单数.
希望帮到你!