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题目内容
The reliable production of usable energy through the controlled fusion of hydrogen atoms into helium remains an elusive dream: even the most ardent efforts to achieve it have thus far been_______.
- Aconcealed
- Bdebated
- Cthwarted
- Dmaligned
- Eveiled
- Ffrustrated
C,F显示答案
以上解析由 考满分老师提供。