【題目】All the photographs in this book, stated otherwise, date from the 1950s.

A. unlessB. untilC. onceD. if

【答案】A

【解析】

考查連詞辨析。句意：除非另有說明，所有的圖片始于19世紀(jì)50年代。A. unless除非; B .until直到；C. once一旦; if .如果。分析句子可知，本句缺少表示“ 除非”的連詞。且從句省略了主語All the photographs和 are。故選A項(xiàng)。

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