先说意思：我应该把她也邀请来吗?
明确一个,这是过去的事情,事实上是我没请Mary,而在问的人来看该请,即该做而没做,用should+ have done 所以选B
C must have done 表示对行为的一种判断,即 She must have forgotten to send me an e-mail.表示“她一定忘了发份电子邮件给我了”（这只是我的一种判断）
A D 是一样的,都是事情未发生是说的,而根据时态来看是已发生的事,所以不选.
解释一个英语单选题——You didn'tinvite Mary to the hall?——_________her,
2个回答
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