选 B
过去分词表示被动完成
when first ___to the market .the toys didn’t attract much attention.
when first ___to the market .the toys didn’t attract much attention.
a.introducing
b.introduced
c.was introduced
d.being introduced
理由啊
a.introducing
b.introduced
c.was introduced
d.being introduced
理由啊
英语人气：405 ℃时间：2019-11-18 06:20:56
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