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【題目】— 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:——王醫(yī)生是一個UNICEF志愿者嗎?——不是,他是一個ORBIS的醫(yī)生,他已經工作了幾年了。不定冠詞a/an一個,通常用于泛指,a用于輔音因素開頭的單詞前,an用于元音因素開頭的單詞前;故選A

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