一道英语选择,说出理由
问题描述：
一道英语选择,说出理由
It's terribly cold today,isn't it?
Yes._______yesterday.
A.So it was B.So was it C.So it was D.So is it
我感觉是D,但到底是B还是D不确定
答
选B.so+助动词/be动词/情态动词+主语 的结构也是有时态变化的,昨天就用过去时