一道英语的变句型题

题目

一道英语的变句型题
the little girl could help to cook when she was three.
when she was three画线
就 画 线 部 分 提 问
______________________________?

答案

the little girl could help to cook when she was three.
→when could the girl help to cook?
我是从事英语的,不明再问.