A number of students _____ the sports meeting. The number of the students who take part in ____200.[ ]

A. take part in, is                            

B. takes part in, are  

C. taking part in , are                        

D. taking part in, is

有以下程序段struct st{int x;int *y;}*pt;int a[]={1,2},b[]={3,4}; struct st c[2]={10,a,20,b}; pt=c;以下选项中表达式的值为11的是______。

A．*pt->y

B．pt->x

C．++pt->x

D．(pt++)->x