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题目内容
（商丘师范学院-基础英语1）
. (单选题) When flint _______ to the market, these products enjoyed great success.(本题1.0分)
A、 introducing
B、 introduced
C、 introduce
D、 being introduced
A、 introducing
B、 introduced
C、 introduce
D、 being introduced
参考答案
