When flint to the market,these products enjoyed great success.? A.introducing B.introduced ? C.introduce D.being introduced? 题目和参考答案——青夏教育精英家教网——

题目内容

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

A.introducing　　　　B.introduced　?

C.introduce　　　　　D.being introduced?

答案：B

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