when was it invented?when充当句子中什么结构?invented呢?
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whenwasitinvented?when充当句子中什么结构?invented呢?whenwasitinvented?when充当句子中什么结构?invented呢?whenwasitinvente
when was it invented?when充当句子中什么结构?invented呢?
when was it invented?when充当句子中什么结构?invented呢?
when was it invented?when充当句子中什么结构?invented呢?
1.主语2.宾语