When first _____ into the market, these products enjoyed great success.

A. introducing　 B. introduced

C. introduce　 D. being introduced

 

B

本題考查非謂語動詞的用法。products與introduce的關系是被動的，故選B。when引導的是一個省略句，補全為 “When they were first introduced to the market, …”。全句意思為：“這些產品一投放市場，就獲得了成功。”

 

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