问题描述：
[单选]
焦炭己被证明比我们试验其他任何燃料 更为有效。（）
A．Coke has proved to be more efficient than any other fuel we have tried.
B．Coke has proved to be more efficient than any fuel we have tried.
C．Coke was proved to be more efficient than any other fuel we have tried.
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