The purpose of the research had a more important meaning for them than .
A. ours
B. those of ours
C. it had for ours
D. it did for us
网友回答
A. ours
B. those of ours
C. it had for ours
(答案→)D. it did for us
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D。