Math is the first subject that i want to learn.
数学是我想要学习的第一门课程
Math is the first subject(主句) + that引导宾语从句(i want to learn),learn缺少宾语,则that在此处做宾语,指代前面的subject
Math is the first subject that i want to learn.
数学是我想要学习的第一门课程
Math is the first subject(主句) + that引导宾语从句(i want to learn),learn缺少宾语,则that在此处做宾语,指代前面的subject