Li Hua, do you know the final exam is drawing near? Time is limited, so I can't have you ________ time

like this.[      ]

A. waste  

B. to waste

C. wasting 

D. wasted

早期牙周病，牙周袋深度在4～5mm，CPL记分为

A．0
B．1
C．2
D 3E．4