E it should be
Space shuttle astronauts are being modified in 'Performing a risky maneuver that required precision flying'.
Boils down to 'D' and 'E'.
Simultaneously while is incorrect and awkward in 'D'
The leaves 'E'.
sc4
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Source: Beat The GMAT — Sentence Correction |
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NSNguyen
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IMO: E
Please share your idea and your reasoning 
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