— Tom, you've got an A in the final English exam. Congratulations!  

— Thanks. But I never thought the result came out so fast. The papers ______ when I left the teacher's

     office just now.[ ]

A. had been marked    

B. were still being marked    

C. are still marking    

D. had been marking

急性病毒性肝炎黄疸型与无黄疸型实质上的区别在于()

A．病原体的不同

B．基本病变不同

C．基本病变的程度不同

D．临床经过不同

E．传染源不同