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

A. aB. an C. the D .不填

 

B

【解析】

試題分析：句意：我認(rèn)為發(fā)現(xiàn)一個(gè)UFO是不尋常的事。這里應(yīng)該用不定冠詞表示泛指，unusual是以元音因素開頭的單詞，所以應(yīng)該用an,故選B。

考點(diǎn)：考查冠詞的用法。

 

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