Young people who have got jobs may realize university lessons can't be the only preparation for

all of the situations ________ appear in the working world.[      ]

A. where  

B. when

C. that  

D. what

特朗普制教学形式是通过（）的方式实现的。

A.大班上课

B.小班讨论

C.个人独立研究

D.教师与学生签订“工约”