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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