In economics, mustard seeds are considered a commodity because they are essentially interchangeable, “essentially” being a word that admits a degree of latitude. In 2021, researchers J. Shorish, M. Stephenson, and M. Zargham devised a mathematical model of fungibility (interchangeability) that would account for such variation. Distinguishing “exactly the same” and “nearly the same” commodities—whether crops, lumber, or precious metals— among their primary aims.
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Verbal·Standard English Conventions·Form, Structure, and Sense
hardWhich choice completes the text so that it conforms to the conventions of Standard English?
A
having been
B
being
C
was
D
were