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I think it’s unusual thing to find a UFO...

I think it’s         unusual thing to find a UFO.

A. aB. an  C. the         D .不填

 

B 【解析】 试题分析:句意:我认为发现一个UFO是不寻常的事。这里应该用不定冠词表示泛指,unusual是以元音因素开头的单词,所以应该用an,故选B。 考点:考查冠词的用法。  
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