Different【 hypotheses】 have been put forward to e
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Different【 hypotheses】 have been put forward to explain why UFOs exist.
A. sentence
B. comments
C. conclusions
D.theories
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答案:D
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。括号的单词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
