请教两道题目

leadership

98年5月份第三题

3. Comparatively few cities in the United Slates have competing newspapers today, a major change from 1900 _____ more than two newspapers.

(A) because then most large cities having

(B) when did most large cities have

(C) then most large cities that had

(D) when most large cities had

a major change 是什么成分阿，这句子怎么看着这么别扭？

leadership

thanks !!!!!!!!!

虚无飘渺

说是同位语不知道对不对？a major change就是指前半句few cities in the United Slates have competing newspapers today这件事情