Before he was arrested, he had taken _______ one-month holiday, and stayed in the country with ________ 18-year-old girl, one of his studentsA.a, aB.an, anC.a, anD.an, a
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C解析本题考查冠词。句中a one-month holiday泛指一个月的假期；a 18-year-old girl泛指一个18岁的女孩。句意：在他逮捕之前，他和一个18岁的女孩，是他其中的一个学生在乡下度过了一个月的假期。