The lack of systematic data on volunteer work is not simply an academic matter. It also limits the ability to make the most effective use of this important resource.

Đáp án chính xác: The lack of systematic data on volunteer work is not only simply an academic matter, but it also limits the ability to make the most effective use of this important resource.

Học sinh quan sát hình ảnh/ngữ cảnh và chọn đáp án đúng: The lack of systematic data on volunteer work is not only simply an academic matter, but it also limits the ability to make the most effective use of this important resource..