When first ______ to the market, the toys didn’t attract much attention.A、introd

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问题 When first ______ to the market, the toys didn’t attract much attention.

选项 A、introducing
B、introduced
C、was introduced
D、being introduced

答案 B

解析由于前后两个分句的主语是一致的，而且toys与动作introduce构成动宾关系，故用过去分词表被动。根据题意选B。

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