In public places, we can often see ______ that tell us useful things, such as no parking, no smoking...
2022-12-26 16:36:19 153次 2015届辽宁省分校高一上学期12月月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
In public places, we can often see ______
that tell us useful things, such as no parking, no smoking, etc.
A. symptoms B.
signs C.
systems
D. signals
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