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【单选题】

According to the rules of the factory, you mustn't ask for leave ______ you have a doctor's note.
A．unless

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

81%的考友选择了A选项

4%的考友选择了B选项

9%的考友选择了C选项

6%的考友选择了D选项

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