题目内容
All the photographs in this book, ____ stated otherwise, date from the 1950s.
| A．once | B．until |
| C．unless | D．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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| A．other than | B．rather than | C．more than | D．less than |
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| A．over | B．in | C．against | D．on |
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| A．despite | B．except that | C．except when | D．besides |
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| A．while | B．until |
| C．if | D．before |
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| A．even if | B．as though |
| C．as long as | D．unless |
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| A．unless | B．though |
| C．although | D．when |
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| A．While | B．Once | C．If | D．Until |