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МатематикаВопрос:
9 You ....... clean your teeth three times a day. A must B mustn't
Ответ:
Решение:
Чистить зубы три раза в день - это рекомендация или необходимость. "Must" означает "должен", "mustn't" - "не должен". В данном контексте подходит "must" (должен).
Ответ: A must
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