Gạch chân lỗi sai và sửa lại :
`1.` My parents have to go to work on Sunday, haven’t they ?
`2.` The child could swim at the age of ten, couldn’t they ?
Gạch chân lỗi sai và sửa lại :
`1.` My parents have to go to work on Sunday, haven’t they ?
`2.` The child could swim at the age of ten, couldn’t they ?
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