No student go out of school for snacks during the break without the teacher’s permission.
A. shall
B. must
C. will
D. may
网友回答
(答案→)A. shall
B. must
C. will
D. may
解析：句意：没有老师的允许，没有学生在课间可以出学校买零食。这里用shall，用于第二人称或第三人称表示“警告，允诺，命令，规定”，must必须，will愿意，may可以，根据句意选A。