Our playground is not so tidy and beautiful as before, students must ____ dirty things on it.
| A．be stopped to throw | B．be stopped throwing |
| C．stop to throw | D．stop from throwing |
Our playground is not so tidy and beautiful as before, students must ____ dirty things on it.
| A．be stopped to throw | B．be stopped throwing |
| C．stop to throw | D．stop from throwing |
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