Different hypotheses have been put forward to explain why UFOs exist.

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问题 Different hypotheses have been put forward to explain why UFOs exist.

选项 A、sentence
B、comments
C、conclusions
D、theories

答案D

解析 句意:有很多不同的理论来解释为什么不明飞行物会存在。画线单词hypotheses意为“假说,理论”。A项sentence意为“句子,宣判”;B项comment意为“评论”;C项con—clusion意为“结论”;D项theory意为“推测,理论”,与画线单词意义相近。故本题选D。
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