2. 外语
  3. In 1796 investigations into the chemical nature of diamond concluded ______a form of pure carbon.

In 1796 investigations into the chemical nature of diamond concluded ______a form of pure carbon.

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问题 In 1796 investigations into the chemical nature of diamond concluded ______a form of pure carbon.
选项 A、that it
B、is it
C、that it is
D、is that
答案C
解析
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