Example sentences of "not [verb] been [vb pp] at [art] " in BNC.

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No Sentence
1 The evolution of such a plant could not have been achieved at a single stroke .
2 He had been ill for many months and his five-year term would not have been renewed at the National People 's Congress which starts on Monday .
3 Others were part of basic research on living tissue , and their benefits could not have been realised at the time .
4 The defect in any case may not have been known at the time of the sale .
5 In a later case in which service had been attempted in Belgium , the Belgian Central Authority certified that service had proved impossible , the defendant not having been found at the address given .
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