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.

admin2012-05-07  47
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 情态动词题。must have done表示对过去情况肯定的推测，对过去情况否定的推测则用couldn’t have done，所以选D。
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