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
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
单项选择题
The earthquake happened in ______.
A．late 1960s
B．the late of 1960s
C．late of 1960s
D．late of the 1960s
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