问题
选择题
When first____ to the market, these products enjoyed great success.
A．introducing
B．introduced
C．introduce
D．being introduced
答案
答案：B
考查非谓语动词作状语的用法。introduce 与主语these products为动宾关系所以用过去分词做状语。“首次引入市场这些产品就获得了巨大成功”选B