两道比较结构的省略题

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

答案是B，对于B我没有疑义。这是than后面省略主谓而只保留介词短语

但是prep1-114

A study on couples' retirement transitions found that women who took new jobs after retiring from their primary careers reported high marital satisfaction, more than when retiring completely.

(A) more than when retiring

(B) more than if they were to retire

(C) more so than those who retired

(D) which was more so than those retiring（c）

(E) which was more than if they had retired

为什么a不能理解为省略，而只保留状语从句呢。  望解答。

如同PREP解释说的，实战中,碰到when从句要提高警惕,利用when从句来代替因果关系从句,或者无中生有的增加when从句是GMAT考试中制造错误选项的常见手法,并通常带有迷惑性.

A中表达的是同一批人的比较。但实际意思 应该不是同一批人的比较。

正解

不补全对比的是一个主语的两种状态， 而且 ing形式用的也没道理吧）

补全以后才是两个对象的对比