英语：选用and,but,so填空.
问题描述：
英语：选用and,but,so填空.
I have two dictionaries,_____ you can keep this one for two weeks.
David,you can go now._____ before that,close the door.
答得好的继续加分,
答
I have two dictionaries,so you can keep this one for two weeks.我有两本字典,所以你可以持有这一本两个星期.
David,you can go now.And before that,close the door.大卫,你现在可以走了,走之前要关门.（无转折,递进关系,所以用and）