People was killed while they were accrossing the road since they think a car can stop _______ a few metres and they were careless .请各知识人士提供正确解答并告之原因,谢!
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within这里要表示的意思是：有人乱穿马路而丧命是由于他们错误的 认为车可以在几米的距离内停下。显然在这三个词中只有within可以表示在一定距离内。for 表示动作持续有多久，如They have walked for 5 metres. 他们已经走了5米远。after 表示在。。之后，而且通常在后面加时间的一点。如：I'll be here after 5 p.m. 我5点后会在这里。