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
h is greater than was so
h is greater than it has been
這道題爲什麼B是對的啊?
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主語，accounted for謂語，a greater proportion爲同位語，修飾前面整個名詞短語。
考點：
指代一致(Agreement)
1. which就近指代名詞，不能指代完整的一句話;
2. it在文中，會繼承被指代對象的特性，業即本文中，it 如果指代 a great proportion或者 the spending ，都繼承了a great proportion或者 the spending 發生在presidential campaign of 1992的.特性，造成比較的邏輯關係錯誤，要引以注意。
3. 比較對象的內容，時態關係，邏輯含義均要對等。
選項分析：
(A) it指代的是a greater proportion整個短語，錯誤，應該用that來指代proportion，但是因爲只是名詞短語的比較，that可以省略而不帶任何歧義。
(B) Correct;原句補完整：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) 現在完成時使用錯誤，in any previous election說明應用過去完成時;they指代soaring television costs，使邏輯意義錯誤，比較結構需要比較對象對等，前者爲a great proportion 是一個量詞不能和具體的費用對比，而且其他的election不一定是soaring的;同時have been與前面的accounted for不平行，只要也要用have done。
(D) Which不能指代前面整個idea;so用於省略重複的動作，使用錯誤。
(E) Which不能指代前面整個idea;it指代不清，且has been時態與後面的in any previous election不符。
以上就是對於GMAT語法實例分析的全部內容，值得注意的是考生朋友在拿到GMAT語法題是需要先將原句進行，並能找出GMAC想考察我們哪方面的考點，最後在將選項進行對比，最後祝大家都能考出好成績。