The purpose of the research had a more different meaning for the

The purpose of the research had a more different meaning for them than ______.
A、for ours it had
B、it did for us
C、with us
D、with ours
【正确答案】：B
【题目解析】：这题考查指代的用法，it代指The purpose of the research，did代指had a more important meaning，句意是：这项调查的目的对他们比对我们的意义更重大。选B。