All the photographs in this book,     stated otherwise, date from the 1950s.
A．unlessB．untilC．onceD．if
A

試題分析：句意：除非另有說明，所有的圖片始于19世紀50年代。由此可知，空白處應該使用A選項引導條件狀語從句。在這一從句中，省略了主語和be動詞。因此，正確答案為A選項，選A。
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