固位体固位力的大小与下列哪一项无关()

A．辅助固位形

B．材料性质

C．固位体的类型

D．牙体形态

E．基牙轴面聚合度

— I telephoned him twice and I couldn't get through to him.

— I think that the line might have been out of  order, ____     ?   [ ]

A. don't you        

B. wasn't it    

C. do you    

D. hadn't it