一I heard that you got an A in the chemistry exam．Well done!

一Thanks，I know that you     a good job as well．

A．shouId have done

B．need have done

C．must have done

D．could have done

孔子曾指出：“生而知之者上也，学而知之者次也，困而学之，又其次也；困而不学，民斯为下也。”可见孔子的教育思想非常反动。