英语 八年级 选择题 标准 情态动词 must/should 表义务 — 英语选择题 冀教版·英语 Unit 2 Safety AI 三重审校通过 题目 A safety notice says visitors are required to stay behind the yellow line; it is a rule, not just advice. Visitors ___ stay behind the yellow line. A. should B. mustn't C. must D. can 登录后查看答案与解析 用此考点生成试卷 本单元全部练习题 更多英语选择题