题目内容

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

   A. introducing             B. introduced

   C. introduce                D. being introduced

 

 

B

解析:

根据题干提示,此题省略了主语和be动词,补全后应为When these products are

first introduced to the market,因products与introduce之间构成动宾关系,所以应用过去分词形式,所以正确答案为B。

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