◎ 题干
When first __________ to the market, the computer software was not a success due to its complexity in operation.
A.introducingB.being introduced
C.introducedD.to be 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 first __________ to the market, the computer software was not a success due to its complexity in operation. A.introducingB.being introducedC.introducedD.t…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【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。