the signs on the wall means 'no littering'.对 on the wall 提问

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/15 16:04:20

the signs on the wall means 'no littering'.对 on the wall 提问悬赏80财富- -急
急刚刚那个人的同学- -同一张试卷

Which signs means 'no littering'?
补充：你肯定觉得奇怪,为什么对地点提问,而不用Where提问,因为这里的on the wall意思是“墙上的”,而不是在墙上.类似举例：
The girl in the boat is my sister.(对in the boat提问）：Which girl is your sister?
赠人玫瑰,手留余香!——福来美Flower Magic
楼主以后有需要解答的题目,可以直接百度信息给我.

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