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Different hypotheses have been put forward to explain why UFOs exist.
A: sentence
B: comments
C: conclusions
D:theories
B: comments
C: conclusions
D:theories
参考答案
参考解析
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-elusion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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