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Internet users posted photos showing a huge crack on the roof of a factory in Shanghai and said what looked like part of a plane had fallen through its roof. The triangular component with a length of less than one meter fell into the factory but luckily no one was injured. According to the aviation authority, the part has been confirmed as a component from a Boeing 777, which closes up the undercarriage to seal the space. Its absence doesn't affect the plane's flight itself but is clearly a potential hazard to people on the ground.
How many people were injured after a huge crack on the roof of the factory?
A. None
B. 7 people
C. 777 people
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