2. 外语
  3. They are sure they have all the facts they need to ______the existence of a black hole.

They are sure they have all the facts they need to ______the existence of a black hole.

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问题 They are sure they have all the facts they need to ______the existence of a black hole.
选项 A、obtain
B、maintain
C、verify
D、display
答案C
解析 动词辨析 obtain “获得，得到”；maintain“维持；维修；坚持；赡养”；verify“核实，查对，证明，证实”； display“陈列，展览；显示，表现”。
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大学英语四级

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