When first to the market the computer software was not a success due to its complexity i

问题补充：

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

答案：

A. introducing

B. being introduced

(答案→)C. introduced

D. to be introduced

解析：考查非谓语动词。本题为过去分词作状语，与逻辑主语the computer software为被动关系，故选C。