英语选择.--We didn't see him at the lecture yesterday.--He ___ i

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英语选择.
--We didn't see him at the lecture yesterday.
--He ___ it.
A.would have not attended
B.can not have attended
C.needn't have attended
D.mustn't attend
但我选的是D,为什么选B不选D?

先翻译一下：
——我们没看见他来参加昨天的演讲.
－－他不可能昨天来了.
所以按语境选B.另外,D不选的原因是：情态助动词+不定式的完成式中没有mustn't have done的结构,更不用说用它来表示“过去不可能做过某事”.但must have done这种结构是有的,解释为“一定已做”.从中可知must要与have done用的话,应是用表肯定,而不是否定的形式.
PS：lanPoh有一个错误我要说明一下.
否定式"can't/couldn't have+过去分词”表示“过去不可能发生的事情”.疑问形式和否定形式表示对过去发生的行为怀疑或不肯定.用“can"语气较强烈,“could”语气较委婉.所以是语气问题而不是时态上的区别.

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