Trade with other societies was vital to the Parthian Empire, which reigned in Mesopotamia from around 247 BCE to 224 CE. Its people profited by selling textiles, spices, and iron, items that greatly in demand.
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Verbal·Standard English Conventions·Form, Structure, and Sense
easyWhich choice completes the text so that it conforms to the conventions of Standard English?
A
was
B
is
C
were
D
has been