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【单选题】

In 1796 investigations into the chemical nature of diamond concluded ________a form of pure carbon.
A．( that it

B．( is it
C．( that it is
D．( is that
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根据网考网移动考试中心的统计，该试题：

2%的考友选择了A选项

12%的考友选择了B选项

80%的考友选择了C选项

6%的考友选择了D选项

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