制洞的常用牙钻是（）。

A.球钻

B.裂钻

C.倒锥钻

D.球钻、裂钻、倒锥钻

E.都不正确

— Some countries are taking action to occupy the islands of the South China Sea.   

— Yes, but I think they ____be punished sooner or later.     [ ]

A. could            

B. can                

C. may        

D. shall