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　　Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election. A.a greater proportion than it was B.a greater proportion than C.a greater proportion than they have been D.which is greater than was so E.which is greater than it has been 这道题为什么B是对的啊? 句子分析： Soaring television costs accounted for … half the spending in the presidential campaign of 1992, a greater proportion than in any previous election. Soaring television costs主语，accounted for谓语，a greater proportion为同位语，修饰前面整个名词短语。
　　考点： 指代一致(Agreement)
　　1. which就近指代名词，不能指代完整的一句话;
　　2. it在文中，会继承被指代对象的特性，业即本文中，it 如果指代 a great proportion或者 the spending ，都继承了a great proportion或者 the spending 发生在presidential campaign of 1992的特性，造成比较的逻辑关系错误，要引以注意。
　　3. 比较对象的内容，时态关系，逻辑含义均要对等。 选项分析：
　　(A) it指代的是a greater proportion整个短语，错误，应该用that来指代proportion，但是因为只是名词短语的比较，that可以省略而不带任何歧义。
　　(B) Correct;原句补完整：Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than(the proportion)(television costs had accounted for of the spending)in any previous election。
　　(C) 现在完成时使用错误，in any previous election说明应用过去完成时;they指代soaring television costs，使逻辑意义错误，比较结构需要比较对象对等，前者为a great proportion 是一个量词不能和具体的费用对比，而且其他的election不一定是soaring的;同时have been与前面的accounted for不平行，只要也要用have done。
　　(D) Which不能指代前面整个idea;so用于省略重复的动作，使用错误。
　　(E) Which不能指代前面整个idea;it指代不清，且has been时态与后面的in any previous election不符。