问题
选择题
_____ the night of October 31, Americans enjoy the time of Halloween. [ ]
A. In
B. At
C. On
D. For
答案
答案：C
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_____ the night of October 31, Americans enjoy the time of Halloween. [ ]
A. In
B. At
C. On
D. For
答案：C
步骤一：
；步骤二：
；步骤三：
；步骤四：
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