eighteen/ they/ old/ years/ are/. A. They are eighteen old years B. They are old eighteen years C. They are eighteen years old D. They are old years eighteenĐoạn văn15/30eighteen/ they/ old/ years/ are/. They are eighteen old years They are old eighteen years They are eighteen years old They are old years eighteenGiải thíchĐáp án đúng là C