单项选择题

Slavery was ______ in the U.S. in the 19th century.

A．retailed
B．canceled
C．abolished
D．stroked
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单项选择题
A doctor should examine the patient to ______ where the pain is localized.
A．alienate
B．alternate
C．allocate
D．ascertain
单项选择题
When the engine finally started she gave a(n) ______ sigh of relief.
A．adaptable
B．sensible
C．audible
D．applicable
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