GMAT Sentence Correction (SC) | Re: A year advantage in a new computer product or process being

karisma and Sayantan nailed it. I downloaded this document from a different thread, worked on few and when i read this quickly chose B as it was the best among the worst choices. As Karisma said non standard source misguiding us clearly reminds me of Mcelroytutoring who started a thread recommending not to practice questions out of Official sources instead spend money on official sources!
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While that may not be appropriate for quant it is certainly turning out to be true in terms of of Verbal
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