2. 外语
  3. You ______ John in the street this morning. He’s been dead for ages.

You ______ John in the street this morning. He’s been dead for ages.

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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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