— Why didn’t you go to the party last night?— Because my parents were busy and I had to m

问题补充：

— Why didn’t you go to the party last night?

— Because my parents were busy and I had to my little brother at home.

A. look after B. look at C. look around

答案：

解析：look after照顾；look at看；look around游览，到处查看。句意：昨晚你为什么没有去聚会？——因为我的父母很忙，我不得不在家照顾我的小弟弟。故选A。