ExercisesContentsDownloadsUNIT 10: HAVE TO, MUST, SHOULD: OBLIGATION, PROHIBITION, NECESSITY, ADVICEQuestion 1 / 30请完成全部题目,最后查看答案与解析GRAMMAR · B1 Exercise 1 · Exercise 1Choose the correct answer.When we were at school we _____ wear a uniform.Aought toBmustChad to保存并进入下一题 →