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【参考答案】

at→in
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to→from
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A．The new technology used to build roads.B．The ability to transport goods over land.C．The trade in grain and cotton.D．The linking of smaller local roads into one long roa
A．The new technology used to build roads.
B．The ability to transport goods over land.
C．The trade in grain and cotton.
D．The linking of smaller local roads into one long roa
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