All the photographs in this book, _______ stated otherwise, date from the 1970s.
A．untilB．onceC．ifD．unless
D

試題分析：考查連詞辨析。Until直到…才；once一旦，if如果；unless除非,如果…不…；句意：如果沒有標明，這本書里的所有的作品都可以追溯到20世紀70年代。故D正確。
點評：連詞的詞義辨析要放在上下文的語境中進行，要注意上下文的語義的串聯(lián)以及邏輯關(guān)系的推理，特別要注意一些連詞和時間狀語的固定搭配。
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