【題目】When first to the market, these products enjoy great success.

A. introducing B. introduced C. introduce D. being introduced

【答案】B

【解析】

試題考查被動語態(tài)。完整形式為when (these products were) first introduced to the market,作時間狀語從句，為避免主語重復(fù)省略括號內(nèi)容。句意：這些產(chǎn)品初次被引進(jìn)市場就取得了巨大成功。故選B。

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