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Sentence Correction: Subject Verb Agreement - A Plural Subject Consisting of Singular Nouns that are Connected by 'and'

While the relative costs of concrete and steel are a predominant consideration in the design of a skyscraper, of no less importance to civil engineers is the time needed to fabricate the structural elements and the distance of the project site from the production sites of the raw materials.

Incorrect.

This answer choice is grammatically incorrect. The singular verb is does not agree with the plural subject the time needed...and the distance, etc.

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Well done!

This answer choice corrects the Subject Verb Agreement mistake in the original question by changing the singular verb is to the plural verb are.

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 Incorrect.

While this answer choice corrects the Subject Verb Agreement mistake in the original question by changing the singular verb is to the plural verb are, it is stylistically flawed.

The phrase civil-engineering importance is awkward and changes the meaning of the original sentence. The importance of an issue for the professionals - civil engineers - may be different from the importance of the issue for the profession or discipline of civil-engineering.

Also, the phrase in which the structural elements are fabricated is stylistically inferior because it unnecessarily changes the noun phrase time needed for the fabrication, etc. into a passive sentence.

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Incorrect.

While this answer choice corrects the Subject Verb Agreement mistake in the original sentence, by changing the singular verb is to the plural verb are, it introduces a Parallelism mistake which makes it grammatically incorrect. The construction A and B requires that A and B belong to the same part of speech. In this answer choice, B is a noun (distance) whereas A is a complete sentence (how long it takes).

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Incorrect.

This answer choice repeats the Subject Verb Agreement mistake in the original sentence. The singular verb is does not agree with the plural subject the amount of time needed...and the distance, etc.

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In addition, the phrase amount of time needed in the corrected sentence is redundant. It is not necessary to use the words amount of -- the phrase time needed expresses the same meaning.

of no less importance to civil engineers is the time needed to fabricate the structural elements
of no less importance to civil engineers are the time needed to fabricate the structural elements
of equal civil-engineering importance are the time in which the structural elements are fabricated
for a civil engineer, of no less importance are how long it takes to fabricate the structural elements
of equal importance to a civil engineer is the amount of time needed for fabricating the structural elements