Sentence Correction (SC) | Astronomers at the Palomar Observatory have discovered a distant super

Hello expert,
This question really confused me, cuz I have met a similar question but the correct answer is different. Would you help to compare these 2 questions?
The question is here: https://gmatclub.com/forum/a-recent-stu ... 54641.html
A recent study on Lyme Disease suggests that people who are bitten by ticks, especially by the lone
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