While the teacher was explaining the sum on the blackboard, the children A B threw paper aeroplanes around the classroom. C DĐoạn văn1/65While the teacher was explaining the sum on the blackboard, the children A Bthrew paper aeroplanes around the classroom. C DNhập câu trả lời ở đây0/3000 ký tựXác nhậnGiải thíchĐáp án đúng là C (were throwing)