Seldom _____ in such a rude way（）

A.
A．we have been treated B.B．we have treated C.C．have we been treated D.D．have we treated

Have you __56__ asked yourself why children go to school? You will probably say that they go __57__ their own language and other languages, arithmetic, history, science and __58__ subjects. That is quite true, but why do they learn these things? And are these things __59__ that they learn at school? We __60__ our children to school to __61__ them for the time __62__ they are grown-up and have to work __63__ their own. Nearly all they learn at school has some __64__ use in their life, but is that the only reason __65__ they go to school? There is __66__ in education than just learning facts. We go to school __67__ all to learn how to learn, __68__ when we have __69__ school we can continue to learn. A man who really knows __70__ will always be successful, because __71__ he has to do something new that he has never had to do __72__ he will rapidly teach himself how to do it in the best __73__. The uneducated person, __74__, is probably unable to do something new, or does it badly. The purpose of schools, therefore is not just to teach languages, arithmetic, etc. __75__ to teach students the way to learn56.（）