they often go there with their books.they often go there with their books.（对划线部分提问）划线部分：（their）.急,
问题描述：
they often go there with their books.
they often go there with their books.（对划线部分提问）划线部分：（their）.急,
答
What book do they often go there with?
答
they often go there with whose books