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【单选题】

The basic causes are unknown although certain conditions that may lead to cancer have been
A．identified

B．guaranteed
C．conveyed
D．notified.

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根据网考网移动考试中心的统计，该试题：

74%的考友选择了A选项

3%的考友选择了B选项

0%的考友选择了C选项

23%的考友选择了D选项

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