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【题目】In many schools, all the students ________ to show their student cards when they enter the library.

A.requiredB.were requiredC.requireD.are required

【答案】D

【解析】

考查一般现在时的被动语态。句意为:在很多学校,当他们进入图书馆时,所有的学生________出示他们的学生卡。分析句子结构可知,主语students与谓语动词require之间构成了逻辑上的动宾关系,所以应用被动语态,该句描述的是图书馆的客观规定,应该用一般现在时。故选D

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