The students in Grade Nine             their homework for more than three hours every day,

so they  _        have any time to play.          [ ]

A. were made to do, hardly        

B. are made to do, hardly          

C. were made do, hardly          

D. are made do, hardly

在冲裁过程中，有时发现废料或工件回升与（）无关。

A.凹模刃口工作部分过长

B.刃口成倒锥形

C.润滑太多

D.凸凹模高度