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题目内容双击单词支持查询和收藏哦～
It can be extremely difficult to uncover direct evidence of conspiracies, given that such activities are by their very nature ________.
- A.interminable
- B.laborious
- C.provocative
- D.illicit
- E.surreptitious
E显示答案
以上解析由 考满分老师提供。
