题目内容
All the photographs in this book, _______ stated otherwise, date from the 1950s.
| A．unless | B．until | C．once | D．if |
A
解析试题分析：考查连词辨析。unless除非,如果…不…；Until直到…才；once一旦，if如果；句意：如果没有标明，这本书里的所有的作品都可以追溯到20世纪70年代。故A正确。
考点：考查连词词义辨析
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