问题描述：
新概念英语2册45课问题
有一句话是：Three months passed,and then one morning,San found his wallet outside his front door.
我想问：
1.,and then one morning,在and前面加逗号是为什么啊?
2.and和then在这里干什么?应该是on one morning啊
3.,and then one morning,是同位语么?
有一句话是：Three months passed,and then one morning,San found his wallet outside his front door.
我想问：
1.,and then one morning,在and前面加逗号是为什么啊?
2.and和then在这里干什么?应该是on one morning啊
3.,and then one morning,是同位语么?
问题解答：
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