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# According to United States Air Force officials, a cannon

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Manager
Joined: 06 Aug 2005
Posts: 90
Location: Minneapolis
According to United States Air Force officials, a cannon [#permalink]

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16 Mar 2006, 13:09
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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.
(B) shooting dead chickens at airplanes has proved itself helpful as a demonstration of
(D) that shoots dead chickens at airplanes proves itself helpful to demonstrate
(E) that shoots dead chickens at airplanes has proved helpful in demonstrating
VP
Joined: 29 Dec 2005
Posts: 1341

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16 Mar 2006, 13:16
(E) that shoots dead chickens at airplanes has proved helpful in demonstrating
Director
Joined: 27 Feb 2006
Posts: 622

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16 Mar 2006, 13:30
^ E ^

"prove itself helpful" is not correct. B,C and D are out.

16 Mar 2006, 13:30
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