【题目】According to the regulation of Education Ministry, a full-time middle school or primary school _______ hold a flag-raising ceremony once a week, except during vacations.
A. shall B. should
C. need D. can
在线课程【答案】A
【解析】句意：根据教育部的规则，一个专职的中学或小学应该每周举行一次升旗仪式，假期除外。Shall用于第一或第三人称，表示警告、命令、允诺、威胁等。根据题干中的regulation判断。故选A。