单项选择题

After being tested in many ways, this newly-designed machine will ______ in the near future.

A．take place
B．put into use
C．come into use
D．take action
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单项选择题
Lincoln thought it was wrong to keep Negroes ______ slaves.
A．in
B．as
C．for
D．at
单项选择题
There is no reason why you should tell them ______ that you are going.
A．for advance
B．in advance
C．on advance
D．of advancing
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