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    精英家教网 > 高中英语 > 题目详情
    _______these coins are of different shapes, sizes and colors, they all date back to a long, long time ago.
    A．SinceB．UnlessC．OnceD．While
    D
    考查连词：A. Since自从，既然B. Unless除非C. Once一旦D. While当…时候，虽然，句意是：虽然这些硬币形状颜色大小不同，但它们都可追溯到很远很远以前。选D。
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