Example sentences of "must [verb] be at [det] " in BNC.

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1 It must have been at that time that his habit of keeping notes on his travels began .
2 They must have been at that game for ages — and no anaesthetics , either .
3 She had said ‘ the rest of you ’ and I had never heard her so distance herself before , but what astonished me was the realisation that my father must have been at that party , must have returned with my mother to the villa in the small hours , must have been aware of me in my little white pyjamas and Panama hat .
4 It must have been at some time , because I can speak it now .
5 This very large accession takes up where the first deposit stopped , and covers the years 1861 to 1920 , in addition to some titles and papers of earlier date which must have been at some time extracted from their proper place .
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