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 verify意为“证实”。obtain意为“获得，得到”。maintain意为“保留，维持，维修”。display，意为“展览，展示，显示”。句意：他们确信拥有全部事实证实黑洞的存在；
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