I'm glad to recieve your letter.
I'm glad to hear from you.
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^__^真心祝你学习进步，如果你对这个答案有什么疑问，请追问，
另外如果你觉得我的回答对你有所帮助，请千万别忘记采纳哟！
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I am glade to receive a letter from you
IM so happy to view the letter from you
It's glad to hear from you
I'm happy to your letter
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