Sometimes I think how grateful I would be today if I had learned more back then about what really matters.
A.Sometimes I feel happy that I was taught what is important at school. B.Sometimes I feel sorry that I didn't learn what is important at school. C.At times I feel resentful that I was not taught anything useful at school. D.At times I feel I should be thankful for those things I learned at school.正确答案B
