i left guangzhou_____the morning of april 16

i left guangzhou_____the morning of april 16 on the morning of april 10th on the morning of the 16th of April后面的of为什么不用in on the morning of the 16th of April 这里为什么不用介词in on the morning of April 21和in the morning on April 21 是On the morning of April还是In the morning of April?这里没有精确到天 10.I remember that Susan left _____ a very cold morning of J 英语翻译On a spring morning in April of 1775,a simple band of co susan left in a cold morning of january.(改错题) WE USUALLY HAVE OUR SCHOOL TRIP ( ) A MORNING OF APRIL.选IN 还 英语翻译On the morning of April 29,2007,from 10:00 to 11:00,hund 英语翻译Good afternoon,everyone.On the morning of April 29,2007,