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

easy

Pumpkins were among the many plant species from the Western Hemisphere introduced into the Eastern Hemisphere in the years following Christopher Columbus’s first transatlantic voyage in 1492. This ongoing transfer of species between hemispheres __________ now known as the Columbian Exchange.

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

A

being

B

are

C

is

D

were