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 greater proportion than it was
- a greater proportion than
- a greater proportion than they have been
- which is greater than was so
我是这样来做这个题目的。
A，C，D，E时态有差异，先看时态。
1992那就是过去的时态，过去选举对现在的比例没有什么影响，排除C，E。
再分析句子结构。
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.
主语Soaring television costs ，谓语是accounted for 宾语 spending 。接下来如果是句子，要么主从要么并列，A是一个句子但他既没有并列连词也没有从属关系的词语，所以A错。
D中SO是多余的，即使去掉so,也没有B 好。
简洁原则嘛
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