I had tomy little sister when my mother was not at home.A. look forB. look afterC. look at

问题补充：

I had tomy little sister when my mother was not at home.

A. look for

B. look after

C. look at

D. look into

答案：

A. look for

(答案→)B. look after

C. look at

D. look into

解析：本题的含义是当我的母亲不在家的时候，我得照顾我的妹妹，look after表示照顾的含义，故本题选B。其它短语的意思分别为look for 寻找，look at看一看，look into窥视，意思不符合句意，故不选。