Though the blacks in the United states have been fighting for equal rights ____ the whites for many

years, they _____ won the battle. [ ]

A. to; still haven't  

B. to; haven't still  

C. with; still haven't  

D. with; haven't  still

执行下列语句，变量sum的值是______。
int sum=0；
for(inti=1;i＜=3；i++)
for(intj=1；j＜=i；j++) sum++；