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GMAT Sentence Correction (SC) | Confused : Usage of Past perfect("Had") vs Simple past

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I came across the following 2 SC questions:

Q1) Beforethe managers started using word processors and graphic representation tools,advertisements designed by in house calligraphers.

OA: the managers started using word processors and graphic representation tools, advertisementswere designed by in house calligraphers.

Q2)Beforescientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers.

OA : scientists learned
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