You be punished if you break the school rules. A. wouldB. shallC. mustD. should

问题补充：

You be punished if you break the school rules.

A. would

B. shall

C. must

D. should

答案：

A. would

(答案→)B. shall

C. must

D. should

解析：考查情态动词用法。Shall用语2,3人称表示允诺，警告；要求，命令，强制；还可以表示法律规定中要做的事情。本题是表示警告；句意：如果你违反了学校的规则，你就会被惩罚。