英语翻译On the Earth Day,the kids were busy___________________________________about environmental protection in the park.

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英语翻译OntheEarthDay,thekidswerebusy___________________________________aboutenvironmentalprotectioninth

英语翻译On the Earth Day,the kids were busy___________________________________about environmental protection in the park.
英语翻译
On the Earth Day,the kids were busy___________________________________about environmental protection in the park.

英语翻译On the Earth Day,the kids were busy___________________________________about environmental protection in the park.
On the Earth Day,the kids were busy _in picking up trash or pasting posters_ about environmental protection in the park.
忙着做某事be busy in doing something.
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On the Earth Day,the kids were...

picked rubbish up or sticked up

Earth day, the children get busy picking up litter in the park or busy Posting green sea lanes