（多选）下列乐器中依靠空气柱振动发声的是（　　）

A．鼓

B．笛

C．箫

D．扬琴

— Is that the small town you often talked about?  

— Right, just the one________ you know I used to work for years. [      ]

A. that.          

B. which       

C. where

D. what