【題目】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引導(dǎo)的時(shí)間狀語(yǔ)從句是一個(gè)省略句，補(bǔ)全為 “When they were first introduced to the market, …”。全句意思為：“這些產(chǎn)品一投放市場(chǎng)，就獲得了成功。”

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