confused between C and D. Please clarify.

  1. 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- shooting does not go with demonstrate.

(B) shooting dead chickens at airplanes has proved itself helpful as a demonstration of -idiomatically wrong.

(C) shooting dead chickens at airplanes proves itself helpful as demonstrating.

(D) that shoots dead chickens at airplanes proves itself helpful to demonstrate-shoots goes with infinitive form to demonstrate.

(E) that shoots dead chickens at airplanes has proved helpful in demonstrating-Parallelism error

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2 Answer(s)

C has flaws:

1: shooting dead chicken  verb is not clear it is referring that canon is shooting at present ,since its a part of study it should be in simple tense.

2:proves itself helpful is wrong  .   has proved helpful  is correct as its a part of study that has proved succesful.

3:helpful to demonstrate ( showing what needs to be done) vs helpful in demonstrating( showing what is already done)   latter is correct in this context..

Intermediate Answered on August 14, 2017.
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Ankita has got it correct on 2 out of 3 counts. Great job!

However, “shooting dead chicken” is not a tense but it is a present participle modifier.

Same logic as:

Student taking computer engineering courses have applied for the position of a lab assistant.

Student -> subject

taking computer engineering courses -> modifies the subject

have applied for ….. -> predicate containing the verb

Arun

Expert Answered 12 hours ago.
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