单项选择题

Lincoln thought it was wrong to keep Negroes ______ slaves.

A．in
B．as
C．for
D．at
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单项选择题
From then on, a sound system of Party Committee meetings was ______ in all leading bodies.
A．constructed
B．instituted
C．confirmed
D．given up
单项选择题
The mini-skirt is______.
A．in fashions
B．in a fashion
C．in fashion
D．in the fashion
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