My friend wanted to know ______ with his new car.[ ]

A. what wrong is

B. what is wrong

C. what wrong was

D. what was wrong

下列选项中属于口腔初级预防的是（）

A.义齿修复

B.充填治疗

C.窝沟封闭

D.牙周刮治

E.正畸矫治