They're helping Mother with the housework.怎么改为附加疑问句
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They're helping Mother with the housework.怎么改为附加疑问句
They're helping Mother with the housework.怎么改为附加疑问句
They're helping Mother with the housework.怎么改为附加疑问句
They're helping Mother with the housework,aren’t they?
aren't they?
aren't they?