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According to United States Air Force officials, a cannon

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Joined: 23 Jun 2011
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Kudos [?]: 16 [0], given: 22

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

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New post 19 May 2012, 03:49
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

91% (01:33) correct 9% (00:00) wrong based on 11 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.

(A) shooting dead chickens at airplanes has proved helpful to demonstrate
(B) shooting dead chickens at airplanes has proved itself helpful as a demonstration of
(C) shooting dead chickens at airplanes proves itself helpful as demonstrating
(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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Re: Confused between "to demonstrate" and "in demonstrating" [#permalink]

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New post 19 May 2012, 04:18
'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, 04:18
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According to United States Air Force officials, a cannon

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