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题目内容双击单词支持查询和收藏哦～
For decades, debates about the potential benefits of seafloor mining in ocean deeps were _____________, because mining at depths greater than 1,000 meters was considered technologically impossible.
- A.protracted
- B.conjectural
- C.virulent
- D.complicated
- E.speculative
- F.extended
B,E显示答案
以上解析由 考满分老师提供。
