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【单选题】

A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A．before

B．until
C．since
D．when
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根据网考网移动考试中心的统计，该试题：

70%的考友选择了A选项

23%的考友选择了B选项

2%的考友选择了C选项

5%的考友选择了D选项

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