题目内容

18．It is said that potato chips ____________ by mistake about a hundred years ago．（　　）
A．inventB．inventedC．are inventedD．were invented

分析 据说薯条是在大约100年前误打误撞而发明的．

解答 答案：D
首先根据时间状语about a hundred years ago，判断用一般过去时，主语potato chips是动作invent的承受者，所以用被动语态，一般过去时被动语态的构成是：主语+was/were+动词的过去分词，主语是复数名词，be动词用were，invent的过去分词是invented，故选D．

点评 本题考查时态和语态．每个时态都有标志词，熟记这些标志词是做题的关键．在没有时间状语的情况下可以根据语境来对时态做出判断．

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