All the photographs in this book，________ stated otherwise，date from the 1950s.
(2012·陜西，25)
A．unlessB．until
C．onceD．if
A
A
解析　考查狀語(yǔ)從句。句意為：除非被特別標(biāo)明，這本書中所有的圖片都可以追溯到20世紀(jì)50年代。所填詞表?xiàng)l件，從句用了省略句，unless意為“除非，如果不”，故選A。
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