When flint _______ to the market, these products enjoyed great success.(本题1.0分) A、 introducing B、 introduced C、 introduce D、 being introduced

When flint _______ to the market, these products enjoyed great success.(本题1.0分)
A、 introducing
B、 introduced
C、 introduce
D、 being introduced

出自：商丘师范学院-基础英语（一）(高起专)

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