No student go out of the school campus after 10:00 at night without permission according to the school regulations.
A. shall
B. must
C. would
D. should
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(答案→)A. shall
B. must
C. would
D. should
解析：考查情态动词。句意：根据学校的规定，晚上十点以后，学生未经允许不能出校门。shall用于第二、三人称时，表示命令、警告、威胁、许可等。故选A。