The old man was so unfortunate that he was hit by a falling tree and killed _____(spot)（当场）
问题描述：
The old man was so unfortunate that he was hit by a falling tree and killed _____(spot)（当场）
答
on the spot,表示当场的意思.
这个老人太不幸乐,被一棵树砸到当场死亡.