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.

admin2018-06-03  65
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 must have done表示对过去情况的肯定推测，而对过去情况的否定推测则用couldn’t have done，所以选D项。
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