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Source: Official Guide for GMAT Review 2016 Sentence Correction; #9

1

In a review of 2,000 studies of

In a review of 2,000 studies of human behavior that date back to the 1940s, two Swiss psychologists, declaring that since most of the studies had failed to control for such variables as social class and family size, none could be taken seriously.

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Gravatar Mike McGarry, Magoosh Tutor

Aug 18, 2015 • Comment

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Section 9.6 Sentence Correction

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