On many trains and buses, there are some special seats ________ out for senior citizens. A．marking B...
2022-12-23 13:58:14 62次 2012-2013学年湖南省怀化市高三上学期期末考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
On many trains and buses, there are some special seats
________ out for senior citizens.
A．marking B．marked C．to mark D．mark
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