She mustn't have seen you的意思是什么?

问题描述:

She mustn't have seen you的意思是什么?
———I wonder why she doesn't say hello to me.
———She______ have seen you.
A、mustn't B、shouldn't C、couldn't D、might not
请问:此题的选项是哪一个?Thanks!

D啊!
我很奇怪她为什么没跟我打招呼
她(可能)没看见你