It ______ a fine day, we went for a walk.
A、is
B、be
C、being
D、to be
【正确答案】：C
【题目解析】：being a fine day做原因状语,it代替后面的we went out for a walk .英语中不能有两个主句,we went out for a walk 前没有关联词,故是主句,it ﹍a fine day 要么是从句要么是分词短语作状语,又因it前没有关联词,故只能是分词短语作状语 ,to be a fine day 又是目的状语,不合句意.
