单项选择题

It's no use ringing me up at the office this week because I'm

A．by my leave
B．at leave
C．in holidays
D．on holiday
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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
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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