Towards evening,an icy rain began to fall and the road became slippery.冠词用法

问题描述:

Towards evening,an icy rain began to fall and the road became slippery.冠词用法
这句话evening前面为什么没有the呢?不是in the evening

in the evening表示的一种状态,began是个暂短性动词,故不能用in the evening,towards evening意为到了晚上.