Teeth: modais de dedução com must (B1)
Teeth are covered by enamel, the hardest material our body produces, but enamel cannot repair itself. Bacteria in the mouth transform sugar into acid, and that acid slowly opens tiny holes. Brushing twice a day helps, although dentists insist that cleaning between the teeth matters just as much. Sweet drinks are especially dangerous because the liquid touches every surface. So if a tooth suddenly hurts every time you drink something cold, something ___ wrong under the enamel, and you should visit a dentist before the pain becomes serious.
Fonte: English for ALL (texto original).
Assinale a alternativa que completa corretamente a lacuna do texto.
- A) can't be
- B) must to be
- C) cannot being
- D) must be
- E) might not be