All the photographs in this book, _______ stated otherwise, date from the 1950s.
A．unlessB．untilC．onceD．if
A
考查狀語從句。題干意思是：除過被標(biāo)明的以外，書中其余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，引導(dǎo)詞意思是：除非，如果不，選A。
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