According to United States Air Force officials, a cannon : GMAT Sentence Correction (SC)
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According to United States Air Force officials, a cannon

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Joined: 23 Jun 2011
Posts: 32
Location: India
Concentration: Strategy, Technology
GMAT 1: 710 Q50 V35
WE: Information Technology (Computer Software)
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Kudos [?]: 16 [0], given: 22

According to United States Air Force officials, a cannon [#permalink]

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19 May 2012, 02:49
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Question Stats:

90% (01:34) correct 10% (00:00) wrong based on 10 sessions

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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
[Reveal] Spoiler: OA
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Kudos [?]: 541 [0], given: 19

Re: Confused between "to demonstrate" and "in demonstrating" [#permalink]

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19 May 2012, 03:18
'proves itself helpful' means demonstrates its own utility. The cannon is not demonstrating the reason for its own existence, but rather helping to demonstrate the kind of damage that can result when birds fly into jets.

Between A and E, E is better because it uses the phrase 'that shoots dead chickens' instead of 'shooting dead chickens'. The former describes a type of canon that has been helpful because it can shoot dead chickens at airplanes. The latter describes any canon shooting dead chickens at airplanes.

E it is.
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Re: Confused between "to demonstrate" and "in demonstrating"   [#permalink] 19 May 2012, 03:18
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