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【题目】Whether there are any aliens(外星人)in outer space or other planets is still a ________.

A.storyB.recordC.challengeD.mystery

【答案】D

【解析】

句意:外太空或其他星球上是否有外星人仍然是个谜。

考查名词。story意为故事record意为记录challenge意为挑战mystery意为谜;秘密。根据主语从句的内容确定这仍然是个谜团,故选D

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