Louis Lassen,__made and sold the first hamburger, was an American chef from Connecticut5/15Choose the correct answer A, B, c, or D to complete the sentences. Louis Lassen,_____ made and sold the first hamburger, was an American chef from Connecticut.whichhewhosewhoGiải thíchĐáp án: D Đại từ quan hệ thay thế chủ ngữ chỉ người.