Question

My mother was cooking in the kitchen________l came

My mother was cooking in the kitchen________l came back home.

Answer 1

My mother was cooking in the kitchen （when） l came back home.

“when l came back home”做时间状语从句，修饰“My mother was cooking in the kitchen”，

翻译：当我回家时，我妈妈正在厨房里做饭。

Answer 2

正确：when