【題目】Have you ever seen ________ UFO?

A. a B. an

C. the D. /

【答案】A

【解析】句意:你見(jiàn)過(guò)不明飛行物嗎? UFO縮寫(xiě)詞,名詞詞組,不明飛行物;a/an+名詞單數(shù),可以表示事物的類別; UFO第一個(gè)音發(fā)輔音[ju:],a用在第一個(gè)音為輔音的單詞之前。故選:A。

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