核心问题
At the moment each of the girls was too busy thinking about ____ own personal safety to care much about the luggage. A. her B. their C. his D. our(《新编留美托福签证考试资料》，台北时代留学英语中心) 答案为 A(her)。不知能否选 B(their)?
词典解答
初学者可把 A 看作唯一正确答案。但是,英语教师则应知道,现代英语语法学家已承认用法 B 的正确性:
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Each of the students should have his/their own books. (GCE) 每个学生都应该有自己的书。
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Each of the women wore what they liked best. (PEU) 这些妇女个个都穿着她们最喜欢的服装。
(参见 everybody/everyone...they)