单选题A tunnel would be_______.Aless expensive to be built than a bridgeBmore expensive to be built than a bridgeCless expensive to be built than a railDmore expensive to be built than a rail
单选题
A tunnel would be_______.
A
less expensive to be built than a bridge
B
more expensive to be built than a bridge
C
less expensive to be built than a rail
D
more expensive to be built than a rail
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解析：
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