比较的是women，不同的women
A 比较对象不同，即使比较省略的they，由于they代指前面的women，错
B they代指前面的women，错
D 就近修饰satisfaction错
E which错、they错

Yes, it is. It is used in making a "more than" type of comparison where you also want to refer to a previously stated verb / action (that's where the "so" comes in). In this case, the "so" refers to "reported high marital satisfaction."

Notice here that you are comparing two groups of women: those who take new jobs, and those who retire completely. When making a comparison, you have to make sure you explicitly mention both groups.

(A) 缺少指代women的代词，致使more than的比较对象不对等，satisfaction与when retiring对比。
(C) 正确，those指代women，who took和who retired平行。

又错一遍。。。这里比较的women应该是两批不同的人，一批继续工作，一批完全退休，因此不能用they来指代，应该用those。

比较客体：满意度；比较主体，两类人；误选B, 搞错了比较主体。答案C, women who tooks jobs VS those

wrong: i've always wanted to jump out of a plane, but i've never had the chance to do it. --> this is wrong because the only possible antecedent for "it" is plane, and it doesn't make any sense to talk about "doing" a plane.
correct: i've always wanted to jump out of a plane, but i've never had the chance to do so. --> "do so" = jump out of a plane.

perhaps the most common usage in which you'll see this is "do it" vs. "do so"

he rule i like to use here is this: if it's not a specific NOUN that can be replaced by a PRONOUN (usually "it"), then use the all-purpose replacement "...so".
如果非要还原我觉得是more marital satisfaction than those who retired completely,

虽然这题选对了，纯粹是根据意思 "比较的跟定是人，than后面肯定需要加those",可以对于正确选项C的more so,仍不明白。如何恢复简化以前的版本?