We were about to start___in rained heavily.A when B as C while D since

热心网友

我觉得选C

热心网友

我选B,as表示副代说明.

热心网友

选A,该题是过去将来时的搭配,译为我们正要出发时雨下大了.另外原题的"in"是"it"吧.