One of our rules is that every student wear school uniform while at school.
A. shall
B. could
C. might
D. will
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(答案→)A. shall
B. could
C. might
D. will
解析：考查情态动词的特殊用法。Shall用于所有人称，表示命令，警告，允诺，或者法律，法规中规定要做的事情。本题shall就表示法律，法规中规定要做的事情。句意：我们的规定之一就是每个学生在校都要穿校服。故A正确。