We must stop people from ___(throw)rubbish into the river
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![We must stop people from ___(throw)rubbish into the river](/uploads/image/z/9021551-23-1.jpg?t=We+must+stop+people+from+___%28throw%29rubbish+into+the+river)
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