中性多形核白细胞（PMN）与牙周病，错误的是（）。

A.PMN是牙周组织重要的防御细胞

B.PMN不引起牙周组织的破坏

C.PMN可穿越袋上皮进入龈沟

D.PMN的数量和功能不足与牙周病有关

E.局部和全身因素可通过影响PMN的功能影响牙周病的发生

Without the leadership of our Party and our Government, we ____ these splendid results.  [ ]

A. have achieved          

B. wouldn't have achieved   

C. should have achieved              

D. would not achieve