GMAT Sentence Correction
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Source: PREP
Level: 3
One of the earliest known birds with a beak and contour feathers, Confuciusornis sanctus, with large clawlike "thumbs" on its wings, which probably helped them to climb up to a launching position for flight.
- A with large clawlike "thumbs" on its wings, which probably helped them to
- B with large clawlike "thumbs" on their wings, which probably helped it to
- C had large clawlike "thumbs" on its wings, which probably helped them
- D had large clawlike "thumbs" on its wings, probably to help it
- E had large clawlike "thumbs" on their wings, probably to help it