分类：教育/科学-外语学习-英语考试
问题：Mary
Mary --be in because i saw her in town only a  hour agoA won'tB mustn't may notD can't选择什么并讲解
回答：Mary __B__be in because i saw her in town only a hour ago 
A won't 
B mustn't 
C may not 
D can't 


玛丽可能不在家，因为我一小时前在镇里看到了她.


A won't：将来时，前后时态不一致，不用 
B mustn't ：may的否定形式，意思是：不可能
C may not ：意思是：可以不
D can't ：意思是：不能，不会