题目内容

When first____ to the market, these products enjoyed great success.
A．introducingB．introducedC．introduceD．being introduced
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
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