When first ________ to the market, the c

问题选择题

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

答案：C

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。