March 28, about 20 Chinese cities turned off lights of major buildings for one hour.A. At

发布时间：2020-08-21 01:42:24

     March 28, about 20 Chinese cities turned off lights of major buildings for one hour.
A. At
B. In
C. On
D. Of

网友回答

A. At
B. In
(答案→)C. On
D. Of
解析：在具体一天的前用介词on,故选C
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