关于比较省略 it was 的问题

十指芊芊Cherish

（1） GWD-1-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.

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

这题选B，省略了it was，是因为A中it指代不清吗，如果it指代清晰的话，是不是AB都可以呢

1. A large rise in the number of housing starts in the coming year should boost new construction dollars by several billion dollars, making the construction industry’s economic health much more robust than five years ago.

(A) making the construction industry’s economic health much more robust than five years ago

(B) and make the construction industry’s economic health much more robust than five years ago

(C) making the construction industry’s economic health much more robust than it was five years ago

(D) to make the construction industry’s economic health much more robust than five years ago（C）

(E) in making the construction industry’s economic health much more robust than it as five years ago

这题选的是C，像A中省略了又是错的，这两题都是状语的比较，为什么不一样呢

十指芊芊Cherish

自己顶~

verme

同求。。为什么第一题可以省 第二个不可以呢？？