问题补充:
It has been announced that studentsremain in their seats until all the papers have been collected.
A. can
B. will
C. shall
D. may
答案:
A. can
B. will
(答案→)C. shall
D. may
解析:考查情态动词shall用法。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。句意:据宣布,所有的学生都要坐在位置上,知道所有的试卷都被收齐。说明本句是根据考生的规定所要做的事情。故C正确。