Example sentences of "but [prep] 20 years " in BNC.

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1 She was the British critics ' favourite on both the Bolshoi 's tours here , but for 20 years she played second fiddle to Grigorovich 's wife , Bessmertnova .
2 It may not have been the ideal preparation but after 20 years as a professional , I have got my priorities right . ’
3 Measurements are unstable and poorly predictive in adolescence , but from 20 years individual variability seems to be less and does not increase with age .
4 But at 20 years of age I had no scruples about rubber gloves and bleach , and dealt with the problem straight away .
5 All the strictures detected before 10 years of colitis were benign ( 12/12 ) ; from 10–19 years , 84% were benign ( 21/24 ) ; but at 20 years and over , most ( 61% ) were malignant ( 14/23 ) ( p<0.001 ) .
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