单项选择题

Black people were first brought to America from Africa as ______.

A．workers in factories
B．cotton pickers
C．migrants
D．slaves
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单项选择题
In English all the prefixes are ______ morphemes.
A．inflectional
B．grammatical
C．derivational
D．implicit
单项选择题
After the American Revolution, ______ became the first capital of the United States, being already the largest city in North America.
A．Philadelphia
B．New York
C．Boston
D．Virginia
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