单项选择题

The truth is that it is only by studying history ______ we learn what to anticipate(期待) in the future.

A．and then
B．so
C．by which
D．that
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单项选择题
The medal did not cost much, ______ very good.
A．or was it
B．nor was it
C．or did it
D．nor did it
单项选择题
Ford proposed a system ______ each worker would have a special job to do.
A．that
B．in which
C．which
D．at which
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