When first ＿ to the market, the computer software was not a success due to its complexity in ...

When first ＿ to the market, the computer software was not a success due to its complexity in operation. A. introducing B. being introduced C. introduced D. to be introduced 为什么本题考查的是省略而不是非谓语动词？

C 原句：when it was first introduced to the market, the computer software was not a success due to its complexity in operation.

你好！ 选c 不是省略 When first introduced to the market, these products enjoyed great success. 当第一次投放市场，这些产品享有巨大的成功。 仅代表个人观点，不喜勿喷，谢谢。

when (it was) first introduced ...省略主语和系动词，主句\分句的主语都是 the computer software电脑软件，“当电脑软件第一次被介绍到市场上时，由于它操作起来很复杂，所以并不成功。” 答案C 被介绍。

选C. 省略了主句的主语.When (it's) first introduced to the market, the computer software was not a success due to its complexity in operation.