问题
选择题
_________ March 28, about 20 Chinese cities turned off lights of major buildings for one hour.
A．At
B．In
C．On
D．Of
答案
答案：C
在具体一天的前用介词on,故选C
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_________ March 28, about 20 Chinese cities turned off lights of major buildings for one hour.
A．At
B．In
C．On
D．Of
答案：C
在具体一天的前用介词on,故选C