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Verbal·Standard English Conventions·Form, Structure, and Sense
easy
Trade was vital to the Akkadian Empire, which reigned in Mesopotamia from around 2334 BCE to 2154 BCE. Its people        wool, grain, and clay to sell to neighboring societies. In exchange, they received valuable items, such as wood, stone, and copper.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
produce
B
produced
C
will produce
D
are producing