Shiv2016, I agree with you on the placement of the modifier, but I wouldn't overthink it here. I think you could justify (C) if you really think that the sentence is trying to emphasize that residents had to go 20 miles away -- and that the army base is "extra" information. I think (D) makes more sense than (C) for the same reasons you do, but there's some room for debate. And actual GMAT questions don't leave a whole lot of room for debate.
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One more thing: What are the best sources apart from
official guide to practice from whether its verbal or quant? Sources that provide more GMAT like questions.
Heh heh. That's a sticky, sticky question. For quant, I don't think there's any harm at all in doing non-official questions. At worst, they might not really nail the style of the GMAT -- and non-official practice tests can be pretty inaccurate -- but you're still practicing math when you do non-official questions, and that's good, right?
For verbal... well, it is sooooo unbelievably hard for anybody to copy the style of the actual exam. As you've probably heard us say before: GMAC spends between $1500 and $3000 developing each question, and there's no way that even the best test-prep companies can compete. And when one tiny little detail is the difference between a right and wrong answer on verbal, we're demanding the impossible of test-prep companies if we expect them to write "realistic" verbal questions.
So I can't really endorse any of them -- and if we ever write a gigantic book of GMAT Ninja verbal practice problems, those will be flawed, too. It's fine to learn verbal techniques (and grammar, of course) from test-prep guides, but the best bet is to stretch the official materials as best you can. Official LSATs are good for extra CR & RC -- we'll post something about those soon. And there's always the GMATPrep Question Pack, and you can also purchase older editions of the OGs. For example, only about half of the questions in
OG 12 are repeated in
OG 2017 -- so if you have both books, you can squeeze out some extra practice.
I know: it not a particularly satisfying answer. And we'll post more about all of this in the next few weeks and months.