题目内容

18.A middle school student invented a new robot last term.(改为被动语态)
A new robotwasinventedby a middle school student last term.

分析 一个中学生上学期发明了一个新的机器人.
一个新的机器人上学期被一个中学生发明了.

解答 答案:was invented
首先注意时态,根据时间状语last term可知为过去的时间,本句是对过去事实的一般描述,需用一般过去时;根据所给的句子,原句为主动语态,要求改为被动语态,被动语态中主语为动作的承受者,本句动作的承受者为a new robot,后加be动词+过去分词,表示"被发明",考虑时态,此处主语为单数,be动词为was,invent的过去分词为invented,因此为"was invented".

点评 考生需先理解句意,再结合句法结构,推测出所要填的词语的正确形态.

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