问题
选择题
It has been announced that candidates remain in their seats until all the papers have been collected.
A．can
B．shall
C．will
D．may
答案
答案：B
考查情态动词的用法：shall用于规定，警告，命令，句意是：已经宣布了，考生在试卷收完前要坐在座位上。。选B。
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