All the photographs in this book，________ stated otherwise，date from the 1950s.
(2012·陕西，25)
| A．unless | B．until |
| C．once | D．if |
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All the photographs in this book，________ stated otherwise，date from the 1950s.
(2012·陕西，25)
| A．unless | B．until |
| C．once | D．if |
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