单项选择题

_____are bound morphemes because they cannot be used as separate words.

A．Roots
B．Stems
C．Affixes
D．Compounds
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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
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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