关于情态动词的一道题He_____ to Shanghai,for I saw him a moment ago.A.must have gone B.can't have gone C.mustn't have gone D.can't have been选哪个,给出理由B和D有什么区别

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关于情态动词的一道题He_____ to Shanghai,for I saw him a moment ago.A.must have gone B.can't have gone C.mustn't have gone D.can't have been选哪个,给出理由B和D有什么区别
关于情态动词的一道题
He_____ to Shanghai,for I saw him a moment ago.
A.must have gone B.can't have gone C.mustn't have gone D.can't have been
选哪个,给出理由
B和D有什么区别

关于情态动词的一道题He_____ to Shanghai,for I saw him a moment ago.A.must have gone B.can't have gone C.mustn't have gone D.can't have been选哪个,给出理由B和D有什么区别
选择B.
联系整个句子的意思,就表示:他肯定没有去上海,因为我刚才看到他了.
A.must have gone表示去了还没回来,与意思不相符.
B.can't have gone表示肯定没有去.
C.must’t表示禁止的意思.
如果是must have done的否定的话,不能用mustn't而应用can't.
D.can't have been表示肯定没有去过.
联系整个句子,推测他应该是没有去,并不是没有去过.
如果是说没有去过,那样子与后面那句并没有很大的关系.
从整句的意思来讲就应该选B.
这应该是情态动词对过去的推测,这个题目很普遍.
我的答案有保障.!