Last night Li Ping watched the football match at home when he ________ his homework.

A．need have done

B．must haven done

C．should have done

D．could have worked

杜威认为，传统的教学论在教育本质问题的认识上往往把经验的主体与经验的客体分裂开来、对立起来并片面强调一方，由此陷入“二元论”。