I am glad to hear from him.
比较地道的说法收到某人来信是hear from sb
I am very happy to hear from him.
hear from sb.词组表示“收到某人的来信”
确信！
I am so glad to hear from him;
it's so wonderful for to hear from him
I am glad to receive his letter.
i was really happy to have received his letter
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