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МатематикаВопрос:
6 It isn't necessary for you to join your school's swimming team. a You don't have to join your school's swimming team. b You mustn't join your school's swimming team.
Ответ:
a You don't have to join your school's swimming team.
Пояснение: Don't have to означает отсутствие необходимости, а mustn't - запрет.
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