◎ 题干
When last         valuable, these books enjoyed great success.      
[     ]
A. finding                    
B. found      
C. being found                
D. to be found
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“When last valuable, these books enjoyed great success. [ ]A. findingB. found C. being foundD. to be found…”主要考查了你对  【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。