Example sentences of "could [pron] have been [det] " in BNC.

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No Sentence
1 How could I have been such a fool as to take him seriously ?
2 How could I have been such a fool ? ’ she wailed through her tears .
3 How could she have been such a fool ?
4 What I 'm asking is , could there have been some kind of mistake here , at your end ? ’
5 Could they have been any worse , do you think ? ’
6 How could he have been such a poor judge of character ?
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