—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：我妈妈病了。听到别人生病的消息，要表示遗憾，故选D。听到这个消息很遗憾。