改错There were over 500000 deaths due to automobile accidents in the U.S.last year.A third of these
问题描述：
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.
答
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.