For the safety of all the passengers,objects like guns,knives or fireworks be carried onto trains,planes or coaches.
A.may | B.needn't | C.should | D.mustn't |
2019·山东济南·一模 查看更多[1]
更新时间:2019-11-19 10:24:32
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【知识点】 must否定表示禁止解读
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