把You mustn't drop litter in the schoolyard改为同义句怎么改?______ ______litter in the schoolyard.

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把You mustn't drop litter in the schoolyard改为同义句怎么改?______ ______litter in the schoolyard.

把You mustn't drop litter in the schoolyard改为同义句怎么改?______ ______litter in the schoolyard.
把You mustn't drop litter in the schoolyard改为同义句怎么改?
______ ______litter in the schoolyard.

把You mustn't drop litter in the schoolyard改为同义句怎么改?______ ______litter in the schoolyard.
don't drop

Don't drop

Please no