Mary ___ come to the party,but i am not sure of the time yet,because she must finish her work fitst

问题描述:

Mary ___ come to the party,but i am not sure of the time yet,because she must finish her work fitst
A mustB mayC can't dD may not
答案选B 为什么我觉得应选A?

选B
这句话可译为:Mary可能会来参加晚会,但是我还不确定时间,因为她必须先完成工作.
后面的解释说她必须先完成工作,所以说是可能会来;表示不肯定