题目内容
2.The professor mentioned a useful tool to help us think.(改为被动语态)A useful toolwasmentioned by the professor to help us think.
分析 教授提到了一个有用的工具来帮助我们思考.
一个有用的工具被教授提到来帮助我们思考.
解答 答案:was mentioned.原句中的mentioned得知是一般过去时,改为被动语态的结构是:主语+was/were+过去分词+by+宾语.主语是A useful tool是单数,故答案是was mentioned.
点评 此题要求把主动语态变为被动语态,做这类题时,首先由原句的谓语确定采用哪种被动语态结构,再看主语,二者结合即可得出答案.
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