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When flint _____________ to the market, these products enjoyed great success.

A. introducing                         B.introduced

C. introduce                            D.being introduced

 

答案:B
解析:

该题的题意为:当燧石被引入市场后,这些产品获得了极大成功。该题考查过去分词短语作状语代替状语从句的情况。注意的是过去分词introduced的逻辑主语(flint)和句子的主语(these products) 并不一致,因此判断分词的时态和语态时应特别注意。

 


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