老题新问

Q16:

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.

1. a greater proportion than it was
   
2. a greater proportion than
   
3. a greater proportion than they have been
   

   
   

4. which is greater than was so
   

   
   

5. which is greater than it has been

A的错误是由于IT不能指代这个多变的PROPORTION，那如果我把IT改为THAT可否？？

first, I dont know why you say "proprotion多变

第二,A错在语意重复.

suppose: a greater proportion than it was in any previous election  

then it was what?? 只可能是proportion(内容跟It一样),多此一举

but the sentence below is different, maybe you can get what I mean by comparing these two sentences.

the state’s economy far more diversified than it was ten years ago

it was what?? diversified

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