Water plants: segunda condicional na oração com if (B1)
Water plants do much more than decorate a lake. Their roots hold the soil, their leaves give shade to fish, and many species absorb metals and other pollutants from the water. Engineers have copied this idea and built artificial wetlands that clean waste water from small towns at a very low cost. If every city ___ this natural technology, rivers would be considerably cleaner. Some floating species, however, grow so fast that they cover the whole surface, block the light and kill everything below, which is why they must be controlled carefully.
Fonte: English for ALL (texto original).
Assinale a alternativa que completa corretamente a lacuna do texto.
- A) would use
- B) will use
- C) is using
- D) has used
- E) used