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МатематикаВопрос:
10. You ... clean your teeth twice a day. a) must b) mustn't
Ответ:
В этом предложении говорится о необходимости совершать действие (чистить зубы дважды в день). Для выражения необходимости используется модальный глагол 'must'.
Ответ: a) must
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