单选题：This gold mine was discovered by accident．

题目内容：

This gold mine was discovered by accident． A．by air
B．by chance
C．at large
D．at ease

参考答案：

答案解析：

The CompassThe great sea voyages of Europe's “Age of Discove

The CompassThe great sea voyages of Europe's “Age of Discovery”, such as Christo

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