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    【题目】When first _____ to the market, these products enjoyed great success.
    A.introducing
    B.introduced
    C.introduce
    D.being introduced

    【答案】B
    【解析】when引导的时间状语从句是一个省略句，补全为 “When they were first introduced to the market, …”。全句意思为：“这些产品一投放市场，就获得了成功。”

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