When ________ to the market, these products were very popular.
A．introducingB．introduced
C．introduceD．being introduced
B

試題分析:考查非謂語(yǔ)動(dòng)詞。由結(jié)構(gòu)可知When ________ to the market, 在句中做狀語(yǔ)，而邏輯主語(yǔ)these products和introduce之間是被動(dòng)關(guān)系， being introduced表示正在進(jìn)行的被動(dòng)，不合句意，所以B選項(xiàng)正確。補(bǔ)充完整后為：when they were introduced to the market。句意：當(dāng)被引進(jìn)到市場(chǎng)上的時(shí)候，這些產(chǎn)品非常受歡迎。
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