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# According to United States Air Force officials, a cannon

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Intern
Joined: 04 Nov 2009
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According to United States Air Force officials, a cannon [#permalink]

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11 Nov 2009, 00:46
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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

Doubt: Between D and E ,
If the 'D' were "that shoots dead chickens at airplanes has proved itself helpful to demonstrate" , what would be the answer?
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11 Nov 2009, 05:59
E.

The difference between D and E (even if D was "has proved itself" instead of "proves itself") is that the cannon does not prove itself. The only way that concept would make sense is something like "The cannon proves that it is useful to demonstrate..." But even here, there are extra words and the meaning is not as clearly conveyed as in E.

Mirage wrote:
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

Doubt: Between D and E ,
If the 'D' were "that shoots dead chickens at airplanes has proved itself helpful to demonstrate" , what would be the answer?

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Intern
Joined: 04 Nov 2009
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11 Nov 2009, 23:15
Thanks guys !
I got confused between -'to demonstrate' and 'in demonstrating'..

( OA: E)
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12 Nov 2009, 03:04
its between D& E

E is better
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