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Verbal·Standard English Conventions·Form, Structure, and Sense
easy
Trade was vital to the Srivijaya Empire, which reigned in Southeast Asia from around 600 CE to 1200 CE. Its people        tin, medicines, and wood to sell to neighboring societies. In exchange, they received valuable items, such as spices, silk, and porcelain.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
are producing
B
produce
C
produced
D
will produce