题目

我认为这串钥匙一定是保罗(Paul) 的。I think this set of keys________. 答案：【答案】must be Paul’s/belong to Paul【解析】通过中英文句子对照可知，英文句子中缺少“一定是保罗(Paul) 的”表达，肯定推测用must，后接动词原形；可以用所有格形式，must be Paul’s一定是保罗的；同时这句话也可以表达为“我认为这串钥匙是属于保罗的”，belong to sb属于某人；故答案为must be Paul’s/beloWe all should obey the rules. You ____talk loudly or smoke in the library.A. don't have to B. mustn't C. can't D. shouldn’t