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StaceyKoprince from ManhattanGMAT 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.
B, C, and D don't do this. (In fact, B and D change the original meaning of the sentence to make the second part of the comparison a hypothetical - but the original meaning is that the ones who take new jobs are being compared to those who don't.)
Also remember that, for comparisons, they two things / groups / whatever compared should be parallel. "women who took" and "those who retired" are parallel. The other options aren't. the 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".
perhaps the most common usage in which you'll see this is "do it" vs. "do so":
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.
you would extend this same type of extra freedom to "more so": if the comparison isn't quite parallel, and/or is ambiguous, without the "so", then go ahead and toss it in there; it doesn't have to have a single-word antecedent | 
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发表于 2008-9-13 15:14:00
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