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【题目】The paper ________ by Chinese centuries ago.

A.is inventedB.inventedC.was inventedD.invents

【答案】C

【解析】

句意:纸是几个世纪之前由中国人发明的。

考查一般过去时的被动语态。is invented一般现在时的被动语态;invent一般现在时;was invented一般过去时的被动语态;invents一般现在时动词三单。invent发明;主语the paper 和动词invent是被动关系,所以应该用被动语态;被动语态的结构be +动词的过去分词,从时间状语centuries ago 判断该句时态为一般过去时,所以用was invented,故选C

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