改错There were over 500000 deaths due to automobile accidents in the U.S.last year.A third of theseThere were over 500000 deaths due to automobile accidents in the U.S.last year.A third of these could have been avoided but the drivers hadn't fasten

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改错Therewereover500000deathsduetoautomobileaccidentsintheU.S.lastyear.AthirdoftheseTherewereover50000

改错There were over 500000 deaths due to automobile accidents in the U.S.last year.A third of theseThere were over 500000 deaths due to automobile accidents in the U.S.last year.A third of these could have been avoided but the drivers hadn't fasten
改错There were over 500000 deaths due to automobile accidents in the U.S.last year.A third of these
There were over 500000 deaths due to automobile accidents in the U.S.last year.A third of these could have been avoided but the drivers hadn't fastened their seat belts.

改错There were over 500000 deaths due to automobile accidents in the U.S.last year.A third of theseThere were over 500000 deaths due to automobile accidents in the U.S.last year.A third of these could have been avoided but the drivers hadn't fasten
There were over 500000 deaths due to automobile accidents in the U.S.last year.A third of these could have been avoided but the drivers hadn't(didn't ) fastened their seat belts.

but-if
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deaths---- deaths
A third of -- one third of

but -if
hadn't- had