Recognized as a National Heritage Area by the United States Congress in 1996, the Rivers of Steel National Heritage Area __________ a region of Pennsylvania that has long been known for its unique natural, cultural, and historical attributes.
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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
was
B
will have been
C
being
D
is