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18.New technology____________to stop the students from cheating in the exam last year.(  )
A.is usedB.usedC.was used

分析 去年在考试中运用了新技术阻止学生们作弊.

解答 答案:C
根据last year可知,这是表示过去的时间状语,所以运用一般过去时态;又因为主语New technology是动词use的承受者,应该用被动语态.一般过去时态的被动语态的构成是:was/were+动词的过去分词,主语是单数,所以用助动词用was,故选C.

点评 判断动词的时态,要通过所给的时间状语或语境去判断动词存在的状态;判断动词的语态,要看看主语是谓语动词的执行者还是承受者.

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