后面都是表语glad的补足语.
学习是一件愉快的事! (*^__^*)
请及时采纳,多谢!I was giad that all my classmates were fond of the cake这一句是不是定语从句？（I）（ was）（ giad）（ that all my classmates were fond of the cake）不是定语从句主语系动词 表语表语补足语