Example sentences of "the [noun] must be due " in BNC.

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1 Even without him playing the improvement in the defence must be due to a large degree to his presence .
2 The damage to the contents of the freezer must be due to :
3 Some of the gaps must be due to chance , but there is no mistaking the insularity of interest which these volumes display .
4 Although the drift of coarse material on the upper part of the beach must be due to wave action and not to current action , the role of currents in moving material over the sea floor is disputed .
5 Some of the increase must be due to migration as the maximum increase biologically possible in the time would be a doubling of the population .
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