问题
选择题
_____ March 28, about 20 Chinese cities turned off lights of major building for one hour. [ ]
A. At
B. In
C. On
D. Of
答案
答案：C
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_____ March 28, about 20 Chinese cities turned off lights of major building for one hour. [ ]
A. At
B. In
C. On
D. Of
答案：C