单选题:White smoke__________25~30 meters above the hill as they app 题目分类:英语 题目类型:单选题 查看权限:VIP 题目内容: White smoke__________25~30 meters above the hill as they approached it.A. has been seen riseB. had been seen risingC. was seen riseD. was seen rising 参考答案: 答案解析: