[Phương]

[10/9/2017, 10:49:18 AM] Cám ơn các bạn!

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[Phương]

[10/9/2017, 10:51:37 AM] Cám ơn các bạn!

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[Phương]

[10/9/2017, 10:52:12 AM] Cám ơn các bạn!

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[Phương]

Bai viết theo thứ tự như sau: 1550->1551->1553

[ivynguyen]

First, we’re truly sorry for such late response, especially in forum 911. During the previous week, our system had some problems and needed maintenance. There was a day on which students could not log in forum. However, we are committing to deliver good quality work within 48 hours in forum 911 next week. Thus, please excuse us for such unexpected technical problems.
Please check my notes and feel free to leave comments if you have any questions. Good luck with the practice and the actual test!

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[Phương]

Mình không hiểu lắm lúc nào thì dùng “by phones” và lúc nào thì là “through phones”?