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Amy is _______ unusual girl. She has traveled to 15 countries in _______ world.

A. a; the   B. a; \   C. an; the    D. an; one

C 【解析】 试题分析:句意:艾米是一个不一般的女孩。她已经去世界上十五个国家旅行过。不定冠词a/an表示某一类人或某事物中的任何一个,经常用在第一次提到某人或某物时,用不定冠词起介绍作用,表示一个。a用于辅音音素前an用于元音因素前。unusual,元音音素开头,in the world,在世界上,固定短语,故选C
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