◎ 题干
_________ March 28, about 20 Chinese cities turned off lights of major buildings for one hour.
A.AtB.InC.OnD.Of
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“_________ March 28, about 20 Chinese cities turned off lights of major buildings for one hour.A.AtB.InC.OnD.Of…”主要考查了你对  【介词短语】【介词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。