题目内容

Students  ______ remain in their seats until all the exam papers have been collected.
A．mustB．shallC．mayD．can
B
考查情态动词shall的用法。Shall用于二三人称时表示一种语气，如命令、允诺、规定、警告等等。句意：学生们要保持坐在自己的座位上直到所有的试卷被收齐。Shall在这里表示一种规定。所以选B。
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