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Standard English Conventions / Form, Structure, and Sense Difficulty: Medium

The Proto-Nilotic language, common ancestor of fifty-five African languages with similar linguistic properties, blank like all protolanguages, hypothetical: there’s no direct evidence these ancestral languages actually existed.

Which choice completes the text so that it conforms to the conventions of Standard English?

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Explanation

Choice A is the best answer. The convention being tested is subject-verb agreement. The singular verb "is" agrees in number with the singular subject "the Proto-Nilotic language."

Choice B is incorrect because the plural verb "are" doesn’t agree in number with the singular subject "the Proto-Nilotic language." Choice C is incorrect because the plural verb "have been" doesn’t agree in number with the singular subject "the Proto-Nilotic language." Choice D is incorrect because the plural verb "were" doesn’t agree in number with the singular subject "the Proto-Nilotic language."