It was()it rained heavily that they didn't come.A.as B.becauseC.forDsince 为什么不选C

问题描述:

It was()it rained heavily that they didn't come.A.as B.becauseC.forDsince 为什么不选C

这是()下起了大雨,他们没有来。
a.作为
b.因为
c.为

FOR 加短语可以表示因为 而it rained heavily 是主谓宾都全了,不是短语,是个完整句子了,除非改成for it's heavy raining

for后面加名词结构,不能加一个句子,而because后面可以加句子.
如果是以下这样也对.It was for the rain that they didn't come.

because可以引导状语从句,而for只能引导短语,如果用for的话那就得改成for it raining