题目

食品废料、杂草、落叶等能够通过堆积自然分解，成为有用的有机肥料。 答案：正确The students ________about a film when the teacher came into the classroom.(　) A. talked　　　　　　　　　　　　　　　　   B. was talking C. were talking　　　　　　　　　　　　  D. was talking about