问题
选择题
All the photographs in this book, ________ stated otherwise, date from the 1950s. [ ]
A. unless
B. until
C. once
D. if
答案
答案：A
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All the photographs in this book, ________ stated otherwise, date from the 1950s. [ ]
A. unless
B. until
C. once
D. if
答案：A
（）
