选择题:The _____ stuck on the envelope says “By Air”. 题目分类:华北水利水电大学-水利水电工程-大学英语(3) 题目类型:选择题 查看权限:VIP 题目内容: The _____ stuck on the envelope says “By Air”. A) diagram B) label C) signal D) mark 参考答案: