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【单选题】

The doctor will not perform the operation_________ it is absolutely necessary.

A、so
B．if
C．for
D．unless
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根据网考网移动考试中心的统计，该试题：

6%的考友选择了A选项

16%的考友选择了B选项

22%的考友选择了C选项

56%的考友选择了D选项

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