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Students ___________ remain in their seats until all the papers have been collected.
A.mayB.shallC.needD.can
B

试题分析:考察情态动词用法。情态动词shall还可以可用于二、三人称的肯定句中?表示说话人给对方的命令、警告、允诺、 威胁等。也可以用于根据法律法规?必须做某事。如According to law, you shall give all your money to your daughter。句意:学生们要坐在位置上直到所有的试卷都被收起来。根据句意说明这是按照考试的规定要做的事情。故B正确。
点评:在平时的学习中既要注意情态动词的基本含义,也要注意情态动词的特殊意义,如must偏偏,非得;should竟然;mustn’t禁止,千万不能;等等。情态动词Shall用于所有人称,表示命令,警告,允诺;以及法律规定中要做的事情。
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