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All the photographs in this book, ____ stated otherwise, date from the 1950s.

A.once B.until
C.unlessD.if

C

解析试题分析:考查连词辨析。A. once一旦;B. until 直到;C. unless除非;D. if如果;句意:这本书所有的插图,除非被特别标注,都有有原于20世纪50年代。根据句意选C项。
考点 : 考查连词辨析

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