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单项选择题


A．which
B．that
C．those
D．they
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单项选择题A．been used toB．used toC．been used forD．used for

A．been used to
B．used to
C．been used for
D．used for

单项选择题What is the talk mainly about'

A．Advantages of the North in the Civil War.
B．Civilian opposition to the Civil War.
C．Reasons to justify fighting the Civil War.
D．Military strategy used in the Civil War.,'