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All the photographs in this book,     stated otherwise, date from the 1950s.

A.unless B.until C.once D.if 

A

解析试题分析:句意:除非另有说明,所有的图片始于19世纪50年代。由此可知,空白处应该使用A选项引导条件状语从句。在这一从句中,省略了主语和be动词。因此,正确答案为A选项,选A。
考点:考查连词辨析

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