－ What did she ask you just now?

－ She asked me             .

A．where do I study

B．where I study

C．where did I study

D．where I studied

对深形楔状缺损引起的牙本质过敏首选的治疗方法为（）

A.药物脱敏

B.牙髓治疗

C.牙周洁治治疗

D.直接充填治疗

E.垫底后充填治疗