it ---as the team made its way to the front.

问题描述:

it ---as the team made its way to the front.
Awas snowed B had been snowing C was snowing Dhad snowed

C能翻译一下什么意思吗?这里的考点是什么?当那一对人向前线努力行进时,天在下雪。这里有时间状语吗?可判断为过去进行时?为什么?靠语感?