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
The search was ______ when the fog got thicker.
A．called off
B．called on
C．called in
D．called for
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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