强调句9.It was ____it was raining so hard that we had to stay at home all day.
问题描述：
强调句9.It was ____it was raining so hard that we had to stay at home all day.
A.since
B.for
C.as
D.because
WHY,因为都是表示原因,为什么用BECAUSE
答
从语气上来讲,because>since>as>for
because是连词.表示直接而明确的原因和理由,语气最强.
since语气比because弱,是对方已知的,不是根本的或直接的原因,是附带的原因.
as只说明一般的因果关系.
for表示所说的理由是一种补充说明.
这道题目中,raining是必须待在家里的非常明确直接的原因,所以选择D.