13.------It was fine yesterday.

-------________.And very day for fishing,isn’t it?

A.So it was         B.So it is                C.So was it          D.So is  it

【解析】D本题考查so的用法。    So+主语+助动词，表示对上述说法的同意；而So+助动词+主语则表示上一种情况也适用于下一种。本句子的意思是：昨天天气不错，今天天气也不错。