they usually have a big party at home at Christmas划线部分提问at home at Christmas

they usually have a big party at home at Christmas划线部分提问at home at Christmas
they usually have a big party at home at Christmas划线部分提问at home at Christmas

they usually have a big party at home at Christmas划线部分提问at home at Christmas
When and where do they usually have a big party

When and where do they have a big party?

When and where do they usually have a big party？