问题补充：
---My mother is ill in hospital.
---
A. Oh, is she OK?
B. What’s wrong?
C. I don’t know.
D. I’m sorry to hear that.
答案：
A. Oh, is she OK?
B. What’s wrong?
C. I don’t know.
(答案→)D. I’m sorry to hear that.
解析：句意：我的妈妈生病住院了。我听到这个很遗憾，在英语中听到不幸的消息要先表示遗憾，故选D
