—My mother is ill. —.A. I think so.B. That’s OK.C. Really? Thank youD. I am sorry to hear

问题补充：

—My mother is ill. —.

A. I think so.

B. That’s OK.

C. Really? Thank you

D. I am sorry to hear that.

答案：

A. I think so.

B. That’s OK.

C. Really? Thank you

(答案→)D. I am sorry to hear that.

解析：句意：我的妈妈病了。听到这个消息很遗憾。当听到不好的消息，首先要表示遗憾。故选D