单选题 In a second hand bookshop, Billy came across a book which he thought was certainly a ______ edition.

【正确答案】 A

【答案解析】[解析] rare“罕有的，稀罕的”；scarce“缺乏的，不足的”；seldom“很少”：HarDly“几乎不”。句意为：在旧书店，比利遇到了一本他认为确实是珍藏版的书。