Seventy percent of the students _____ taken part in the work and seventy percent of the

work _____been finished. [ ]

A. has, has  

B. had , had  

C. has, have    

D. have, has

下列哪项不是大脑瘫痪常见的下肢畸形（）

A.跟形足

B.髋屈曲内收

C.膝屈曲挛缩

D.马蹄足

E.股直肌挛缩