According to our school rules students not carry mobile phones when taking a exam. A. wi

问题补充：

According to our school rules, students not carry mobile phones when taking a exam.

A. will

B. may

C. shall

D. need

答案：

A. will

B. may

(答案→)C. shall

D. need

解析：句意：根据我们学校规定学生参加考试的时候不可以带手机。Shall用于第三，第二人称可以表示“规定，命令，警告，允诺等”，从前面的our school rules,可知用shall，will“将会”，may“可以”，need“需要”，选C.