WE USUALLY HAVE OUR SCHOOL TRIP ( ) A MORNING OF APRIL.选IN 还是 ON

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WE USUALLY HAVE OUR SCHOOL TRIP ( ) A MORNING OF APRIL.选IN 还是 ON
WE USUALLY HAVE OUR SCHOOL TRIP ( ) A MORNING OF APRIL.选IN 还是 ON

WE USUALLY HAVE OUR SCHOOL TRIP ( ) A MORNING OF APRIL.选IN 还是 ON
on 应该算是具体的时间.