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Despite their numerous attempts to do so, scientists have not been able to sustain a controlled nuclear fusion reaction.
  • Atheir numerous attempts to do so, scientists have not been able to 分析该选项
  • Btheir numerous attempts to do it, scientists have not been able to 分析该选项
  • Cthem numerously attempting to do so, scientists have not been able to 分析该选项
  • Dtheir numerously attempting to do so, scientists cannot 分析该选项
  • Etheir numerous attempt to do so, scientists were not able to 分析该选项
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正确答案: A

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