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Verbal·Standard English Conventions·Form, Structure, and Sense

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The Proto-Atlantic-Congo language, common ancestor of 1,453 African languages with similar linguistic properties, __________ 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?

A

were,

B

is,

C

are,

D

have been,