We must stop people from ___(throw)rubbish into the river

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Wemuststoppeoplefrom___(throw)rubbishintotheriverWemuststoppeoplefrom___(throw)rubbishintotheriverWe

We must stop people from ___(throw)rubbish into the river
We must stop people from ___(throw)rubbish into the river

We must stop people from ___(throw)rubbish into the river
throwing
from 是介词后的动词用ING