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Harry Coover invented super glue by acci...

Harry Coover invented super glue by accident. (变成被动语态)

Super glue _________ _________ by accident.

 

was invented 【解析】 句意:哈里·库弗偶然间发现了强力胶。 单数名词super glue放句首做主语,谓语动词invented变成一般过去时态的被动形式was invented。故答案为was invented。  
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