◎ 题干
When flint _____ to the market, these products enjoyed great success.
[     ]
A. introducing
B. introduced
C. introduce
D. being introduced
◎ 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 flint _____ to the market, these products enjoyed great success. [ ]A. introducingB. introduced C. introduce D. being introduced …”主要考查了你对  【过去分词】【省略句】  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。