请选择ABCD*k(A5G4S6S/L1t—My mother is ill. I have to take care of her at home. —____________.-n*i8o5_1t
A. Thank you-n*i8o5_1t
B. Oh, I don't know-n*i8o5_1t
C. I'm sorry to hear that.-n*i8o5_1t
D. That’s all right.-n*i8o5_1t