-- Mum is ill in bed now. I must her. A. look forB. look afterC. look atD. look on

问题补充：

---- Mum is ill in bed now. I must her.

A. look for

B. look after

C. look at

D. look on

答案：

A. look for

(答案→)B. look after

C. look at

D. look on

解析：句意：妈妈现在卧病在床。我必须照顾她。A寻找B照顾C看D观看，看待。