GMAT Sentence Correction
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Source: PREP
Level: 4
Before scientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers.
- A scientists learned how to make a synthetic growth hormone, removing it painstakingly
- B scientists had learned about making a synthetic growth hormone, they had to remove it painstakingly
- C scientists learned how to synthesize the growth hormone, it had to be painstakingly removed
- D learning how to make a synthetic growth hormone, scientists had to remove it painstakingly
- E learning how to synthesize the growth hormone, it had to be painstakingly removed by scientists