英语同义句转换 They count the birds once a year.They __英语同义句转换They count the birds once a year.They ____ ____ ____ ____ once a year.

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英语同义句转换 They count the birds once a year.They __
英语同义句转换
They count the birds once a year.
They ____ ____ ____ ____ once a year.

答案
add up the birds