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Brother is doing homework.
兄弟正在做作业。
youdao
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Grandpa is writing a letter . Brother is doing homework.
爷爷在写信，哥哥在做作业，妈妈们在做晚饭。
youdao
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I'm reading a book. Grandpa is writing a letter. Brother is doing homework.
我在读书。祖父在写信。弟弟在做作业。
youdao
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My brother is doing his homework .
我的弟弟正在做他的作业。
youdao
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My brother is doing his homework .
我的弟弟正在做他的作业。
youdao