The purpose of the research had a more important meaning for them than.A. oursB. those of

问题补充：

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

答案：

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。