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

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。Introduce与the computer software为为动宾关系故用过去分词作状语。句意：电脑软件初次引进市场是由于操作复杂没有成功。