Example sentences of "[prep] which must have [been] " in BNC.

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1 A publisher is eligible for membership when they publish fifteen titles , ten of which must have been commercially exploited land they must all have been written by PRS writer members ) .
2 They showed some decline in the 1931 Census ( to 48 per cent and 8 per cent respectively ) , part of which must have been the result of high general levels of unemployment in the depths of the inter-war depression .
3 They are distributed along the shorelines in innumerable enclaves ( sensu Crisp , 1 978 ) * many of which must have been isolated for long enough ( since the sea level rose to its present height after the retreat of the last ice sheet ) for them to have evolved local forms to suit the particular selective influences of their habitats .
4 They dropped down into a chamber , the roof of which must have been seven or eight feet high , and where the air seemed quite fresh .
5 But , as she herself points out , the particular activities for which the Shropshire group were prosecuted exist on a continuum with a large number of more common acts , many of which must have been criminalised by the Rant decision ; if the breaking of skin suffices for a conviction of assault , even moderately rough sex becomes problematic .
6 RAF teams from Abingdon had the unenviable task of moving the RAF Museum 's XL318 by road to Hendon , the real cost of which must have been mind-boggling .
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