题干
A means a holiday, and people can do whatever they like during the holiday.
A：seat
B：vacation
C：festival
答案(点此获取答案解析）
B
A means a holiday, and people can do whatever they like during the holiday.
A：seat
B：vacation
C：festival
的展开式中所有系数的和为128，则展开式中
的系数是