i'm happy hear from you.i got yor letter yesterday hear要变为过去式吗
网友回答
应该用to hear
固定搭配：be happy to do sth 很高兴做某事
======以下答案可供参考======
供参考答案1:
happily hearing
供参考答案2:
i'm happy to hear from you. i got your letter yesterday
供参考答案3:
应该用to hear
固定搭配：be happy to do sth 很高兴做某事
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