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 train will ______ from Platform 2 at 3:45 on Tuesday morning.
A. depart
B. arrive
C. stop
D. derail
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