It was ( ) that we went for a picnic in the country.

It was ( ) that we went for a picnic in the country.
A、such nice a day
B、such nice day
C、so nice a day
D、so nice day
【正确答案】：C
【题目解析】：so+adj.that 如此…以至于….句子含义是天气不好，以至于我们去了乡村野餐。