继发性慢性间质性肾炎常见的病因是（） A.尔干肾病 B.非甾体抗炎药 C.高尿酸血症

John is not a man to count on, and it is very likely that the work ____ by the time he arrives here.

A．is finished

B．has finished

C．will finish

D．will have been finished

10a-8b-（6a-8b）

游离龈沟位于（）

A.游离龈与牙体之间

B.附着龈与牙体之间

C.游离龈与附着龈之间

D.牙龈与牙槽骨之间

E.结合上皮与牙体之间