One of our rules is that every student wear the school uniform while at school.A. mightB.

问题补充：

One of our rules is that every student wear the school uniform while at school.

A. might

B. could

C. shall

D. will

答案：

A. might

B. could

(答案→)C. shall

D. will

解析：C 考察情态动词。句义：我们的规定就是每个学生在校期间都要穿校服。Shall用语二三人称，表示警告，命令，允诺，威胁，本句市中是规定。故C正确。