GMAT Sentence Correction
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Source: OG
Level: 3
Some bat caves,like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sentinels and to sound a warning at the approach of danger, and scouting outside the cave for new food and roosting sites.
- A acting as sentinels and to sound
- B acting as sentinels and sounding
- C to act as sentinels and sound
- D to act as sentinels and to sound
- E to act as a sentinel sounding