The little boy gave away all his toys to his younger brother.（对划线部分提问）

你好,很高兴能够在这里回答你的问题,这道题的正确答案应该为：
To whom did the little boy give away all his toys?
或
Who did the little boy give away all his toys to?
“To whom did”这个我搞不懂，求解答啊！其实就是把最后的to放到了句首如果你没学过第一种,那就用第二个我们这个是三个空，只能填那个，不过还是谢谢你！