英语题目，第五大题。 20
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1、"一定，必须"，如：We must obey the traffic rules.
2、"不得不做某事"，如：They have to clean the classroom every day.
3、"禁止，不准备"，如：You mustn't go swimming alone.
4、"没必要做某事"，如：He doesn't have to get up early on Sunday morning.
1、"一定，必须"，如：We must obey the traffic rules.
2、"不得不做某事"，如：They have to clean the classroom every day.
3、"禁止，不准备"，如：You mustn't go swimming alone.
4、"没必要做某事"，如：He doesn't have to get up early on Sunday morning.
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