大卫的妈妈说她很感激，因为是我给了大卫生的希望，我是他最后的朋友。
His mother said that I had kept him alive and that she was grateful that I was her son's last friend.
youdao
我的妈妈和爸爸很风趣，他们是我最亲爱的朋友。
My mother and father are funny. They are my dear friends.
我的妈妈是我最好的朋友。
My mother can be my best friend.
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