Thepurposeoftheresearchhadamoreimportantmeaningforthemthan_______.
A.oursB.those of oursC.it had for oursD.it did for us在线课程D
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。