—Where did you find the professor who made the speech yesterday？

—It was in the hall ______ the students often have a meeting..

A．where

B．which

C．that

D．when

切尖打叶复烤工艺流程分为原料准备、叶梗分离、叶片复烤、（）、烟梗处理、碎叶处理六个工段。

A.叶片包装

B.烟梗包装

C.碎片包装

D.烟梗复烤