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职称英语
You ______ John in the street this morning. He’s been dead for ages.A、mustn’t se
You ______ John in the street this morning. He’s been dead for ages.A、mustn’t se
游客
2023-11-20
28
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问题
You ______ John in the street this morning. He’s been dead for ages.
选项
A、mustn’t see
B、mustn’t have seen
C、couldn’t see
D、couldn’t have seen
答案
D
解析
can’t和couldn’t可表示对事件的否定推断。can’t语气较为肯定,而couldn’t则稍委婉一些。can’t/ couldn’t + be(联系动词或助动词)表示对现在事件的否定推断,如;You can’t/couldn’t be hungry now.You’ve just had dinner。(你现在不可能饿,你刚刚吃过午饭。);can’t/couldn’t + have done表示对过去事件的否定推断,如:John can’t/couldn’t have brought the pia
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