2017年04月 / The History of the Advent Calendar I Oxford Open Learning
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At what time was the agenda originated?
During what period was the schedule initially developed?
At what time did the schedule come into existence?
During what period was the timetable firstly created?
During what period did the calendar originally imagined?
In what period did the agenda initially devised?
In what period was the agenda inception?
In which period did the agenda emerge for the first time?