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发现淞霖英语to have an obligation to do...
to have an obligation to do...

to have an obligation to do...

2018-03-20    01'38''

主播： 淞霖英语

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To have an obligation to do… 1.     Parents have obligations to their children. 2.     Every citizen has an obligation to the society. 3.     Every child has an obligation to support his parents.  
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