Question

【题目】It has been accepted that all the students ________ put on masks before going to school in case they are infected with flu virus.

Answer 1

【答案】shall

【解析】句意：为防止学生感染病毒，学生们在进校前要戴上口罩，这一点大家都已接受。在第三人称作主语的陈述句中，表示规定、规则，用shall。