Grandma is ill. I have to her at home.A. look forB. look upC. look atD. look after

问题补充：

Grandma is ill. I have to her at home.

A. look for

B. look up

C. look at

D. look after

答案：

A. look for

B. look up

C. look at

(答案→)D. look after

解析： 本题的含义是祖母病了，我必须要照顾她，look after表示照顾的意思，故本题选D。