The river smells terrible. People_______ dirty things into it .
| A．must stop to throw |
| B．must stop from throwing |
| C．must be stopped to throw |
| D．must be stopped from throwing |
The river smells terrible. People_______ dirty things into it .
| A．must stop to throw |
| B．must stop from throwing |
| C．must be stopped to throw |
| D．must be stopped from throwing |
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