Example sentences of "must have be [verb] for a " in BNC.

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1 Must have been looking for a house .
2 They must have been riding for a long time , but there was no sign of a large town , only a solitary light shining ahead .
3 It must have been mistaken for a deer . "
4 It is not known where the Gospel was written but it must have been written for a Jewish Christian community .
5 This has the appearance of an emergency military operation which may not apply to the other civil defences , but these too must have been commissioned for a specific occasion , but where the emergency may not have been too critical .
6 Some ore was so intermixed with gangue however , that the concentration by hand was extremely laborious and the mill must have been needed for a long time .
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