对方说i'm sorry to heard that 应该怎样回答啊.

对方说i'm sorry to heard that 应该怎样回答啊.
对方说i'm sorry to heard that 应该怎样回答啊.

对方说i'm sorry to heard that 应该怎样回答啊.
That's all right.

应该是to hear 可以说That's all right!
not at all.