题目内容
17.This kind of machinewas invented (invent) last year.分析 这种机器是去年发明的.
解答 答案:was invented
根据该空处在句中作谓语故填入动词的正确形式,所给词invent是动词意为"发明"可在句中作谓语,根据句子的主语This kind of machine是谓语动词invent的承受者二者形成被动关系,故确定为被动语态,又知句中的时间状语为last year,故确定为一般过去时,故谓语动词为一般过去时的被动语态,其结构为was/were+及物动词的过去分词,根据主语是This kind of machine是第三人称单数,故用was,invent的过去分词为invented,故答案为was invented
点评 本题考查用所给单词的适当形式填空,首先要根据语境明确句意,然后再根据相关语法对所给单词在形式上做出正确的变化.本题考查时态和语态
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