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【题目】— Is doctor Wang _________ UNICEF volunteer?

— No, he is_________ ORBIS doctor. He has worked for it for years.

A. a; an B. an; a C. an; an D. a; a

【答案】A

【解析】

句意:——王医生是一个UNICEF志愿者吗?——不是,他是一个ORBIS的医生,他已经工作了几年了。不定冠词a/an一个,通常用于泛指,a用于辅音因素开头的单词前,an用于元音因素开头的单词前;故选A

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