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【题目】Have you ever seen UFO?

A. a B. an C. the D. /

【答案】A

【解析】句意:你曾经见过一个UFO吗?不定冠词a,一个,用于辅音开头的单词前;不定冠词an,一个,用于元音开头的单词前;定冠词the,这个,那个,通常用于前文提到的人和物;根据句意和语法故选A

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