改错 There were over 500000 deaths due to automobile accidents in the U.S.last year.A third of thesThere 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.AthirdofthesTherewereover500000

改错 There were over 500000 deaths due to automobile accidents in the U.S.last year.A third of thesThere 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 thes
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 thesThere 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
fastened -didn't fasten.but连接表示转折的句子,陈述的是真实情况,所以不应该用表达虚拟意义的过去完成时形式.

but the drivers hadn't (didn't )fastened their seat belts.