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
本题考查非谓语动词。句中逻辑主语为the computer software，与introduce的关系为被动关系，故用过去分词，选C。