Example sentences of "must [vb infin] [verb] from [art] [adj] " in BNC.

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1 He thought this one must have escaped from the National Theatre down the road .
2 This group must have separated from the ancestral flatworms at a very early stage indeed , long before the split between the molluscs and the segmented worms .
3 Although islands may be formed by a variety of processes , such as vulcanism , tectonic movements and accumulation , many of the world 's present islands must have resulted from the Post-glacial rise of sea level .
4 It was obvious that the fish — the ‘ lowest ’ class within the vertebrate phylum — must have evolved from a pre-existing invertebrate form , yet this had occurred before fossils became plentiful in the rocks .
5 The three species of bee seem so closely related that they must have evolved from a single carrion-eating ancestor .
6 Cuvier had claimed to be able to reconstruct an animal from a single bone , but it was Owen who did it , working out that a bone from New Zealand , broken at the ends , must have come from an enormous flightless bird , and being vindicated when the complete skeleton of a moa was found later .
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