According to United States Air Force officials, a cannon shooting dead chickens at airplanes has proved helpful to demonstrate what kind of damage can result when jets fly into a flock of large birds.
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Ashooting dead chickens at airplanes has proved helpful to demonstrate
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Bshooting dead chickens at airplanes has proved itself helpful as a demonstration of
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Cshooting dead chickens at airplanes proves itself helpful as demonstrating
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Dthat shoots dead chickens at airplanes proves itself helpful to demonstrate
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Ethat shoots dead chickens at airplanes has proved helpful in demonstrating
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正确答案: E